Slashdot is powered by your submissions, so send in your scoop

 


Forgot your password?
Close
typodupeerror
×
Science

EPA Fuel Economy Myth: Too High, Too Low? 1378

Posted by Cliff from the estimates-and-science dept.
ThosLives asks: "I have seen here on Slashdot , and just about every other publication, numerous articles about fuel cells, hybrid vehicles, and the inaccuracies of EPA fuel economy stickers. For instance, today there is a review of the Toyota Prius that had the famous line 'Since no car really achieves the EPA estimated mileage...' I happen to drive a car with an EPA sticker of 21 city 25 highway (all figures in miles per gallon). I've driven the car for 47000 miles and the lowest I've ever seen is 23 and some change; the highest, 36.3 (I'm probably about 60% highway 40% stop-and-go and yes, the high was on a long highway trip). My all-time average is about 28.5. As most people get less than the EPA mileage, how does the Slashdot readership fare when it comes to EPA sticker vs actual experience, and on what type of vehicle?"
"Am I a rare breed that can drive my car (2.0L I4, 170 HP, 6-speed manual) aggressively (I've had coworkers and friends say 'woah!' more than I'd like to admit *grin*) and still stomp the EPA sticker? Did I get lucky with a phenomenal car? Am I enough of a counter-example to thwart the belief that the EPA figures are 'too liberal'? Are fuel economy issues just FUD from [insert lobby group of choice]? Or is the answer simply 'it depends on how you drive, what you had for breakfast, and the color of your neighbors' cat?'"
This discussion has been archived. No new comments can be posted.

EPA Fuel Economy Myth: Too High, Too Low? More

EPA Fuel Economy Myth: Too High, Too Low?

Comments Filter:

  • Thus the phrase... (Score:5, Funny)

    by wayward_son ( 146338 ) on Tuesday June 29, 2004 @09:37PM (#9567242)
    Your mileage may vary.

    • Re:Thus the phrase... (Score:5, Informative)

      by mmaddox ( 155681 ) <oopfooNO@SPAMgmail.com> on Tuesday June 29, 2004 @09:59PM (#9567427)
      and everyone's mileage DOES vary.

      I own a 2004 Prius, and I must say that I DON'T get the mileage advertised, although I have seen per-trip variations outside what I so-far consider my normal range. My own figures are closer to 47MPG (combined) for the life of the car, now at 4000 miles. However, my style of driving tends to be shorter trips taken in a hilly locale--both of which negatively influence mileage. Slightly longer trips (a daily commute of 60+ miles) and flatter terrain (coming north to town on the coastal plain) allows a friend here (also with an '04 Prius) to average 53 or so. All other factors seem similar--we have similar driving styles, same tires at same pressure, etc.--but there's a big difference in the mileage figures for the same car. I don't think the EPA takes this into account; they're looking at a bad extrapolation of data based on emissions and a short test--almost a perfect, no-wind, flat-land drive.

      I believe the Prius is a good, capable machine. I can see how, in the right circumstances, the car would do as well as, or better than, the EPA figures. Lots of folks do it.

      Check out Greenhybrid.com [greenhybrid.com] and Prius Chat [priuschat.com] and see what others have to say.

      • Re:Thus the phrase... (Score:5, Interesting)

        by MagicDude ( 727944 ) on Tuesday June 29, 2004 @11:11PM (#9567888)
        There's an interesting statistic on hybridcars.com about how making minimal improvements on gas milage can vastly affect our foreign oil dependency. The jist of it is that if we could improve the average gas milage of the US by one mile per gallon, we wouldn't have to drill in the arctic reserve. If we improced average gas milage by 8 miles per gallon, we wouldn't need to import oil from the middle east at all. So even though we may not be getting sticker values for milage on hybrids, they still kick ass compared to most sedans and such, and espically SUV's and the Hummer with its 8 miles per gallon. Bottom line, even though you aren't getting super phenomenal milage, you're still getting awesome milage, which is good in a variety of ways.

        http://www.hybridcars.com/oil.html [hybridcars.com]

        • Re:Thus the phrase... (Score:3, Insightful)

          by farghen ( 759198 )
          Have you ever noticed that when they widen a road, the traffic doesn't tend to get lighter? Same concept applies here. Just because the mpg gets better doesn't mean we won't need to import oil from the middle east or somewhere.

          • Re:Thus the phrase... (Score:4, Funny)

            by Pharmboy ( 216950 ) on Wednesday June 30, 2004 @10:49AM (#9571553) Journal
            Have you ever noticed that when they widen a road, the traffic doesn't tend to get lighter?

            On the same note, if you make cars that get 50 mpg and are affordable (less than 20k) then yes, more people would buy them, and drive them instead of using public transport, since it would be a price advantage to drive your own. Not counting the fact that your own car is more convenient, etc. This would mean even more traffic because it would be cheaper, more pollution because many individual cars make more smog than one bus/train, and more traffic problems, PLUS we would have to build yet MORE roads to support all the new econo-boxes, all in a vicious cycle brought upon us by the people who are demanding high mileage cars.

            My solution is everyone buy a new truck that gets 13mpg avg. like my new Chevy 2500HD. This way we won't be tempted to drive so much, and be forced to suffer all the problems that good gas mileage brings. ;)

        • Re:Thus the phrase... (Score:5, Funny)

          by Will242 ( 211296 ) on Wednesday June 30, 2004 @01:25AM (#9568538)
          True, every little bit matters... ...but my bicycle gets 20 miles to the burrito. My round-trip commute to work takes 1.2 burritos. And believe me, if I wasn't commuting via bicycle to work, I'd be consuming the fuel anyways.

          • Re:Thus the phrase... (Score:5, Funny)

            by Aardvark99 ( 261926 ) on Wednesday June 30, 2004 @08:04AM (#9569906)
            ...my bicycle gets 20 miles to the burrito. My round-trip commute to work takes 1.2 burritos.
            Great, first the Middle East, now Mexico.

          • Re:Thus the phrase... (Score:5, Informative)

            by katorga ( 623930 ) on Wednesday June 30, 2004 @09:10AM (#9570565)
            Current: Ford F150 5.4L V8, I average 19mpg with a heavy focus on highway driving and light emphasis on difficult offroad or towing duties (live in a very rural area). It does OK and beats the sticker mpg mpg by 2. Towing heavy loads in the 5000-7000lb range, mpg drops to roughly 10mpg which is bad. My next truck will have to be a diesel. Ironically, my car in highschool and college was a 1.8L Diesel VW Rabbit with extended fuel tank. It averaged 60mpg and with the extra fuel tank I could fill it up at the start of summer and not need to refill to school started in the fall. Fuel economy has been solved way back in the day, sadly no one in the US wants diesels.

            • Diesel? Depends on your goals. (Score:4, Informative)

              by chefmonkey ( 140671 ) on Wednesday June 30, 2004 @12:53PM (#9573023)
              You have to consider motivation, too.

              Yes, turbo diesel cars get incredible mileage, but the particulate emissions -- despite dramatic improvements over the past decade -- still fall near the bottom of the heap.

              So, if you want to improve your mileage to save a couple of hundred dollars a year and/or to reduce dependance on foreign oil, a diesel is definitely the car for you.

              On the other hand, if you're concerned about that grey haze hanging low in the sky that you notice every morning driving to work and wonder about what [commondreams.org] it's [californialung.org] doing [airinfonow.org] to [healthandenergy.com] your [ec.gc.ca] lungs [bbc.co.uk], you might want to consider other technologies.

        • Re:Thus the phrase... (Score:4, Interesting)

          by Lumpy ( 12016 ) on Wednesday June 30, 2004 @05:36AM (#9569319) Homepage
          and espically SUV's and the Hummer with its 8 miles per gallon.

          Which is extremely scary. I have a Class C motorhome with an engine that make's the hummer's look like a economy-car engine. It's a Ford 460 gasoline engine with a Holly 4bbl big-bore carb on the top of it. I pull a 30 foot camper body that is over 10 feet tall and have 2 extra tires hitting the pavement. and I get BETTER gas mileage than the hummer.

          There is something really wrong where a vehicle that is 4 times the size and more than twice the engine AND using older non fuel injected fuel technology that is significantly less efficient than the new and supposedly high-tech Hummer.

          What are they doing so wrong on the hummer?

          • Re:Thus the phrase... (Score:5, Insightful)

            by nial-in-a-box ( 588883 ) on Wednesday June 30, 2004 @06:23AM (#9569442) Homepage
            Essentially, nothing. The problem is that people are buying the hummer and other SUVs as car-replacements. That means not only are they getting around in them on a day-to-day basis, but they are also driving them like they drove their cars: fast, hard, and with overdue maintenance. Larger, less efficient vehicles become even more inefficient (not to mention dangerous) when driven hard. Since the hummer is considered to be something of an off-road vehicle, it probably doesn't lose huge points on efficiency in that area. However, since most people are not using the hummer for its claimed intended purpose, it is grossly inefficient, but not shockingly more so than other, similar vehicles. I have a friend who drives a Durango as if it was a sports car and he gets about 8-10 MPG. Basically, a big part of the whole gas consumption problem is not just the vehicles but also how they are driven. We are going to need large, gas-hog engines for the foreseeable future to drive trucks and heavy equipment, but when those engines are overused in personal vehicles, those vehicles need to be thought of as trucks instead of as cars.
        • You've fallen for intentional deceit. I quote your link [hybridcars.com]:
          1. If we raise fuel efficiency standards in American cars by one mile per gallon, in one year, we would save twice the amount of oil that could be obtained from the arctic national wildlife refuge
          2. Raise it by 2.7 miles a gallon to eliminate all the oil imports from Iraq and Kuwait combined
          3. Raise it by 7.6 mpg, we eliminate one-hundred percent of our gulf oil imports into this country

          Only one of these three claims is actually meaningful. Dissecting:

          1. Tr

      • Re:Thus the phrase... (Score:3, Insightful)

        by TWX ( 665546 )
        "I don't think the EPA takes this into account; they're looking at a bad extrapolation of data based on emissions and a short test--almost a perfect, no-wind, flat-land drive."

        I don't see how they could get any better. All parts of the country are different. In Phoenix we have mostly flat terrain with mild inclines in places, but it's bloody hot with thin, smoggy air much of the year, which will affect power and emissions. In Indiana they have more hills, significantly more humid air, and lower temper
      • A friend just had a Prius as a loaner, and another friend just bought the Honda Civic hybrid.

        Being new and eco-geeky, both cars have extra instrumentation to let you know how/what the hybrid gear is doing, including instantaneous mpg readings. I haven't talked with the friend with the Civic since shortly after she bought it, but the friend with the Prius mentioned that the readings on the mgp meter tended to modify his driving habits. I wonder how much mileage on regular cars could be improved just by this

    • Re:Thus the phrase... (Score:5, Insightful)

      by UniverseIsADoughnut ( 170909 ) on Tuesday June 29, 2004 @11:13PM (#9567899)
      Everyones mileage will vary. This is for one very good reason. The mileage of your car is determined on a chassis dynometer running the federal driving cycles for city and highway. The current cycle is the LA77 I belive. That would be a cycle designed in 1977 as if you were driving around in Los Angeles California. So every car is based of a very set driving. Obviously no one will ever drive just like this. Some peoples driving will get poor mileage some great just on their routes they drive.

      The other factor is indeed how you drive. I drive very agressively, but at the same time I get good mileage. Why is this? Well largly because I have worked on projects getting getting highmileage for years, Futuretruck. I understand what the car is doing and what to do to run it where I can get the best mileage. And often if your driving right, you will get good mileage, since making the most of your car and its potential is a very similar thing to how to get good mileage, conserving energy and so forth. Its not how powerful your car is, it's how you drive. A professional driver can roast a fool even when driving much less of a car then the fool.

      Also driving a POS car with no power for years got me good at making the most with little power, so now I don't need to use it all to do what people do with more power. People are often shocked with how my car performs when with me driving, and they have the same car.

      The driving cycle the gov uses is just simply out of date, but even a upgrade won't fix the problem do to as stated, people drive differant in differant places. If you live in the mountains on dirt roads, well your won't do as good. But if you live in kansas and your area is paved, your going to do better.

      Also as car become more varried in what they can do and their drive trains, (gasoline with an auto, vs say a powersplit hybrid with a turbodiesel) the model is going to be harder to fit.

      Also models vary so much. Look at any one model but then look at how much you can change with options. You can had 500+ lbs to an SUV just optioning it from the base to the top end with all the power features and such. So even in a model you get lots of differance, even if the engine and tranny are the same.

      And yes I'm sure many people will say my 19xx gets this many miles per gallon but my new one gets far worse. Yes this is true, but thats because makers have tossed mileage for emissions, which is a very good thing, and in doing that cost some mileage (aside from CO2 the other emissions are not directly linked to mileage, sometimes you hurt mileage to reduce emissions). Also new cars are so much safer to do more structure and such. Your 80s Japanesse cars were tin cans, they had to add a lot of weight to make it safe.

      Things also apply to trucks vs cars. Most people who buy a truck/suv find that it gets better mileage then listed, few will get under 20mpg, just that the fed test isn't freindly to trucks, and some people are just morons and can't drive a truck and get good mileage. But for that there is the inverse and people who drive econobox's and don't get crap for mileage and no where near what it's listed to get.

      If you get in mid 20s mpg with anything, be ok with that, into the 30s, great. For most people the differance doesn't relate to much money saved. Hell, if you buy a bottle of water out of machine, or a coffee at starbucks everyday you wasted more money then the differance in your cost driving to work that day.

      • So what's the secret? (Score:3, Interesting)

        by vrt3 ( 62368 )

        The other factor is indeed how you drive. I drive very agressively, but at the same time I get good mileage. Why is this? Well largly because I have worked on projects getting getting highmileage for years, Futuretruck. I understand what the car is doing and what to do to run it where I can get the best mileage. And often if your driving right, you will get good mileage, since making the most of your car and its potential is a very similar thing to how to get good mileage, conserving energy and so forth. I

  • about right (Score:3, Informative)

    by Sebastopol ( 189276 ) on Tuesday June 29, 2004 @09:37PM (#9567244) Homepage
    i drive a saab 900 SE turbo. mileage should be around 27 hwy, I generally get 27, and on long trips the computer reads 30+.

    city gets lower than the 22 rating, around 18.

  • I drive a 2000 Chevy Lumina. (Score:3, Interesting)

    by the_rajah ( 749499 ) * on Tuesday June 29, 2004 @09:39PM (#9567252) Homepage
    It's a company car with the 3.4 liter engine. I am a fairly assertive driver and put at least 25,000 miles a year on it. I've had 3 very similar cars over the last decade and consistantly get over 25 mpg in a mix of Interstate and light city driving. I think the operative phrase here is "Your mileage may vary".

    For some reason I seem to get reasonable good mileage regardless of what I'm driving. At one time, years ago, I had a 1976 Mercury station wagon, totally a battleship with a 460 V-8 and managed to average 14 mpg with that boat hauling my 5 kids and wife. Again, I emphasize that I'm not an economy minded driver. I am a "Get from point A to point B" with a minimum of fuss and delay sort. I never get more than 10 mph over the posted limit, so I mostly go with the usual flow out here in the plaines. A little over a year ago I drove my mom's Buick to Arizona for her. It's got that nice 3.8 liter engine and is not a light car. I drove 1,750 miles in two days and got 28 mpg, but admittedly it's all Interstate driving, but out West traffic moves at 80+ mph. I was reall surprised. I've also driven some larger Chrysler products on long trips with mileages that were similar. I've concluded that modern cars do a pretty durn good job of fuel economy even in some of the larger configurations.

    "Do the Right Thing. It will gratify some people and astound the rest." - Mark Twain

  • Ford Escord and Mini Cooper S (Score:4, Informative)

    by FatRatBastard ( 7583 ) on Tuesday June 29, 2004 @09:39PM (#9567254) Homepage
    I'm a bit of a wonk when it comes to gas milage: I keep track of all of my gas purchases.

    I used to have a standard 96 Ford Escort (no AC) that regularly got around 30-35 MPG in about a 60/40 Highway to "City" split. I can't remember what the EPA numbers were for that model, but I remember that I was around or slightly above them.

    I now have a MINI Cooper S (fun f**king car). Under the same driving conditions I was getting about 23-24 MPG, which was lower than EPA. I have since moved and the drive is now 30/70 HW vs City and it has dropped to the 21-22 MPG range.

    • Re:Ford Escord and Mini Cooper S (Score:5, Informative)

      by dead sun ( 104217 ) <[aranach] [at] [gmail.com]> on Tuesday June 29, 2004 @09:50PM (#9567359) Homepage Journal
      You aren't that much of a wonk to record gas purchases. I do the same in a little notebook in my car. I take it and calculate the fuel economy on a near monthly basis and it lets me know if there's something wrong with my old '93 Nissan Altima.

      It's really a quick and a smart thing to do and I encourage everybody to do it. Your fuel economy will be one of the first warning signs that your car is developing a problem. If that drops it's time to take the car to get looked at. Just a little time to save major money on repairs later. And if you go to sell your car you have a record of its health.

      • Re:Ford Escord and Mini Cooper S (Score:5, Insightful)

        by bobhagopian ( 681765 ) on Tuesday June 29, 2004 @10:21PM (#9567575)
        Or you can dispense with the notebook altogether if, like me, you always fill your tank fully at the gas station.

        When you fill up, the pump will tell you how many gallons you just pumped into your car. When I get back into my car, I reset the tripmeter (the "second" odometer which can be reset) after noting the number of miles I've driven since the last fuel stop. Then it's just a matter of spending the next minute or so trying to do the division as accurately as possible without getting into an accident.

        This method is certainly no better than what the parent recommended, but it definitely requires less paperwork.

        I also feel the need to say that there are a lot of very serious things that can go wrong with your car that don't affect the fuel economy --- just because you're beating the quoted fuel efficiency rating doesn't mean you don't have to look at other things!

  • About what I'd expect... (Score:4, Informative)

    by grnchile ( 305671 ) * on Tuesday June 29, 2004 @09:40PM (#9567265)
    Car: Audi TT(6spd 225HP 1.8L turbocharged sports coupe). EPA: 20/28. Actual average for a tank has ranged from a low of 24mpg to a high of 33mpg. The 24mpg is a fairly even mix of city and highway driving. That value seems to correspond pretty closely to what one would expect from the EPA numbers. The 33mpg is all highway, of course, in sixth gear, with no turbo.

  • My experience (Score:5, Insightful)

    by ljavelin ( 41345 ) on Tuesday June 29, 2004 @09:41PM (#9567269)
    Of course, MPG greatly depends on how you drive, the state of the car, the fuel, the weather, traffic, and terrain.

    The EPA numbers are a relative guide. They won't tell you exactly what you'll get for fuel consuption. However, you can easily use the EPA numbers to compare two cars' relative fuel efficiency. In fact, I submit that there is no better guide available for cars sold in the US.

    • Gas (Score:5, Insightful)

      by phorm ( 591458 ) on Tuesday June 29, 2004 @10:43PM (#9567734) Journal
      They also depend on what gas you put in the car. Some cars do drive better on supreme.

      When I used to live about 400km from my hometown, I spent the first while driving home on regular, it took about half a tank to get there (45L tank?)

      However, when on a whim I tried "Supreme," it actually took me just a little over a quarter... so milage and bang-for-my-buck was actually better on the more expensive gas. Possibly this also has to do with the mountainous terrain and the fact that the gas gave me more power - not sure.

      I do know that I regularly stick injector-cleaner in, so I shouldn't be getting plugged there. Therefore, I'm willing to state that better gas can give you better milage (and not all gas stations give the same quality gas either)

      • Re:Gas (Score:5, Informative)

        by Osty ( 16825 ) on Tuesday June 29, 2004 @11:31PM (#9568013)

        They also depend on what gas you put in the car. Some cars do drive better on supreme.

        Higher compression engines, or more highly-tuned engines, need higher octane gas. Mostly, it's to prevent knocking (early detonation caused by compression rather than spark). Any good car of relatively recent make (at least the past 10 years, if not older) will have a knock sensor to adjust for lower-octane gas, at the expense of fuel usage. However, if your car is designed to run on 87 octane, higher test gas shouldn't make much of a difference.


        Possibly this also has to do with the mountainous terrain and the fact that the gas gave me more power - not sure

        Actually, there is less energy potential per gallon in higher octane gas than lower. That's not really an issue, though. What most likely happened was that previously you were not using the proper octane-level gas for your engine's compression and the ECM was adjusting to a less optimal program to compensate. As a side note, race gas and airplane gas have much higher octane ratings due to the use of lead additives. Don't try this in your car. Lead will kill your cats in a matter of minutes, not days or months. Race cars and airplanes don't have catalytic converters.


        I do know that I regularly stick injector-cleaner in, so I shouldn't be getting plugged there. Therefore, I'm willing to state that better gas can give you better milage (and not all gas stations give the same quality gas either)

        First off, most additives are snake oil. Pretty much the only thing that works is Techron (and knock-off brands using a similar formulation). If you fill your car at a station with Techron or a similar cleaning additive, there's no reason why you should have to add injector cleaner on your own. If you must, an application once or twice a year is sufficient. Any more often and you're just throwing money away. As for better gas giving you better mileage, that's true up to a point. As I mentioned already, higher compression engines require higher octane fuels. If you're not using the right fuel, your engine will operate inefficiently. Using a higher octane gas than is required is useless if your car can't adjust its compression ratios to make use of it (ie, putting 92 octane gas in a low compression engine like many American-made engines isn't going to help anything, while putting 87 octane in a high compression Porsche engine is going to give you poor performance and mileage). If it's bad gas you're worried about, the most common problem is too much water in the gasoline. You can solve this problem with an alcohol additive to "dry" the gas. Other problems like too much sulfur (I believe that was the problem recently with some gas down in Florida, among other places) don't have an easy remedy, and all you can do is stop driving, have the car towed, and empty the tank. Run a few tanks of good gas through the engine and it'll be fine.


        As others have already stated in this article, there are many other factors to consider. Low tire pressure, dirty air filter, oil, oil filter, bad alignment, too much weight (of the driver, passengers, and any cargo), etc will all have an effect on your mileage. Also, most cars will get their best mileage at low RPMs. If you can cruise at 2000RPM, you're going to get much better mileage than cruising at 5000RPM (just be careful -- you're going to be in a high gear to cruise at such a low RPM, and trying to accelerate in that gear could cause you to lug your engine. This is more important in high-revving, low-torque engines than it is in low-revving, high-torque engines).


        Links:


      • Re:Gas (Score:5, Informative)

        by Trailer Trash ( 60756 ) on Wednesday June 30, 2004 @12:05AM (#9568192) Homepage

        "Supreme", "92 octane", "premium", whatever you call it- is not *better*. It has a higher octane rating. Oddly, that just means that it's more difficult to ignite it.

        If you're getting better gas mileage with it, that means your engine is probably suffering from pre-ignition, aka "pinging", without it. It doesn't mean the higher octane gas has more energy, just that you don't have a cylinder or two working against the rest of the engine. I used to have a jeep that was terrible with pinging unless I used 92 octane, so I am familiar with the situation.

        But for most cars, the 87 is just fine. Note that the 92 doesn't have more cleaners or anything else in it. For the vast majority of cars, 87 works fine and there is no reason to get ass-raped by the filling station for 92 octane. It's like shoe size: a size 13 shoe isn't "better" than a size 8, unless your feet are size 13. If your feet are size 8, however, the size 13 doesn't offer you anything more.

        The FTC has considered regulating the oil industry by disallowing any terminology suggesting that higher octane is better.

        The Low-Down on High Octane Gasoline [ftc.gov]

  • I get reasonable mileage... (Score:3, Funny)

    by cyber_spaz ( 302607 ) on Tuesday June 29, 2004 @09:41PM (#9567270)
    I don't recall the EPA sticker figures on my car, but I have a '98 Saturn, and I get 31-35mpg.

    Of course, I drive like a little old lady from Pasadena (not the one of the Beach Boys fame, though). I usually skip breakfast (perhaps it saves weight?), and my neighbors cats are grey...

  • Look it up here (Score:5, Informative)

    by travisd ( 35242 ) <travisd.tubas@net> on Tuesday June 29, 2004 @09:42PM (#9567284) Homepage
    http://www.fueleconomy.gov/

  • Depends on Cat (Score:5, Funny)

    by pyrrhonist ( 701154 ) on Tuesday June 29, 2004 @09:43PM (#9567295)
    Or is the answer simply 'it depends on how you drive, what you had for breakfast, and the color of your neighbors' cat?

    My mileage dropped drastically after pieces of the neighbors' cat got caught in the air intake.

    If it hadn't been a black cat I wouldn't have run over it at night.

    So, yes, mileage depends on the cat's color.

  • 70 MPG in the Insight, depending on weather! (Score:5, Informative)

    by Tom in Boston ( 453354 ) on Tuesday June 29, 2004 @09:43PM (#9567297)
    When the weather is warm, and that seems to be the biggest factor, I get the EPA-rated 70 mpg or more in my 2000 Honda Insight. 55 on cold winter days.

    Driving at moderate speeds is also a big factor.

  • EPA fuel mileage is a scam... (Score:5, Interesting)

    by BJZQ8 ( 644168 ) on Tuesday June 29, 2004 @09:44PM (#9567303) Homepage Journal
    It's a travesty when a 3800-pound 2004 Pontiac GTO (classed as a compact car) that gets, in reality, about 20/26 is "rated" by the EPA at 15/18, and gets a $1000 "gas guzzler" tax...while the 8000-pound Ford Excursion in the next parking spot gets fuel mileage so bad that it isn't even rated...but is eligible for medium-duty-truck tax writeoffs, and no "guzzler" tax. The whole system should be dumped in favor of vehicle choice, not artificial limits put on cars by the government.

    • Not a scam, just outdated (Score:5, Insightful)

      by green pizza ( 159161 ) on Tuesday June 29, 2004 @09:57PM (#9567412) Homepage
      The whole system should be dumped in favor of vehicle choice, not artificial limits put on cars by the government.

      The truck exemptions (that allow for SUVs to have pretty much any fuel economy [or lack there of]) came from the late 1970s when most trucks were used by farmer and construction workers. The idea was to help those people, who generally are involved in small business and make peanuts anyway.

      Times have changed, now everybody and his brother has an SUV or pickup truck (even if they don't admit it). The regulations haven't changed, not because of a scam, but because the federal beaurocracy is a mess. Sure, the oil-loving administration isn't going to hurry along any changes, but they aren't doing anything actively to prevent such changes either.
      • You also forget the death of the Station Wagon. It is the loss of this vehicle class (primarily due to fuel economy regulations) that has pushed SUVs into the mainstream. If you have more than a couple of kids, you need to have a larger vehicle and an SUV is now the only choice you have, unless you buy a bus.

        The station wagon was a standard staple of middle America for many years, and helped haul millions of children to football and baseball practice. If a car company wants to sell them in America, they are forced by regulations to sell several cheap cars (like the Geo Metro). SUVs don't have this same restriction. Mini Vans also help cover some of this, but even a Mini Van doesn't deal with everything you could haul in an old fashion station wagon. That's why I drive an SUV right now.
    • Unfortunately, it is heavily politicized.

      I'm surprised a GM gets the guzzler tax, I thought they had a corporate edict to not sell cars that are hit with it.

      Unfortunately, I hate SUVs, but when you have a situation where the politicians are inundated by the UAW and the big three to not enact higher economy standards on trucks, that's what you'd expect.

      It's funny that you mention the GTO. Right after the Big Three won their stay from fuel economy on trucks so they can "protect" American workers, GM annou

  • Ahh, so YOU'RE one of those crazy speeding people! (Score:5, Insightful)

    by TyrranzzX ( 617713 ) on Tuesday June 29, 2004 @09:44PM (#9567304) Journal
    (I've had coworkers and friends say 'woah!' more than I'd like to admit *grin*)

    Ye who speeds, cuts people off, and winds through traffic, is the first to reach the red light.

  • A healthy car means good milage (Score:3, Interesting)

    by dead sun ( 104217 ) <[aranach] [at] [gmail.com]> on Tuesday June 29, 2004 @09:45PM (#9567315) Homepage Journal
    I can't speak on the newer cars around since I drive a '93 Nissan Altima. My milage is good, averaging around 30 mpg. I have no idea what the EPA sticker is for that year, but most people that have older Altimas in decent shape seem to get near that. Given that many new cars appear to have 28 mpg for highway driving I'd say I'm doing pretty well.

    I'd have to say that the biggest part of keeping my fuel economy up is keeping my car in good shape though. I had the muffler on my car die recently, the pipe basically decided to rust off the muffler body. I noticed a little bit of noise, but the pipe was still in the muffler and they were both connected to the car so nothing looked out of place. The big tip off that something was really wrong was the reduced fuel economy. Took it in to a trusted mechanic, got it fixed, and the mpg was back to where it should be.

    Also, keep your tires inflated to where they should be. I'm told this is the best way to increase fuel economy.

  • same story here (Score:3, Informative)

    by LuxFX ( 220822 ) on Tuesday June 29, 2004 @09:45PM (#9567323) Homepage Journal
    Similar for me. I only keep track of my mileage when I'm trips, but my 28 mpg highway rated sedan consistently gets over 30 mpg, and I've hit 33 mpg several times.

    I've heard it said that a typical vehicle gets the best mileage at 55 mph, and that for every 5 mph above or below that, subtract 1 mpg. I'm an aggressive accelerator, but I rarely go much over the speed limit any more, so this might be where some of my luck comes from. In fact, the best mileage I've ever gotten was when following my father-in-law when he was driving a moving truck at about 55-60mph the entire stretch from Chicago to Kansas City.

  • depends on technical factors (Score:3, Insightful)

    by holy_smoke ( 694875 ) on Tuesday June 29, 2004 @09:47PM (#9567335)
    how loaded your car is, how much you drive up hill, how often you brake or decelerate, now hard you accelerate, which way and how hard the wind is blowing (literally), how bald your tires are and whether they are aligned, is it a hot day, cold day...the list goes on.

    seriously there are tons of physical factors that will affect your mileage. The EPA estimates are just that - estimates. Values that are in the ballpark of what you can expect to get.

  • 93 vs 02 EPA mileage (Score:5, Interesting)

    by mjh ( 57755 ) <mark AT hornclan DOT com> on Tuesday June 29, 2004 @09:50PM (#9567356) Homepage Journal
    My previous car was a '93 Ford Probe. It consistantly beat the EPA fuel mileage estimates by about 3-5 MPG My current car is an '02 Dodge Neon. It's consistantly worse than the EPA estimates by about 3-5 MPG.

    Reading some of the other posts, it seems that older cars beat the EPA mileage and newer cars do not. Is it possible that the EPA changed their methods for estimating mileage?

    Side note: I sure miss my '93 Probe. Sniff.
    • The EPA estimate is based on the emissions of the vehicle. Recent cars have a number of additions which reduce emissions, but don't affect mileage.

      Call it optimizing for the benchmark.

  • Hi Timmy! (Score:3, Informative)

    by Safety Cap ( 253500 ) on Tuesday June 29, 2004 @09:51PM (#9567369) Homepage Journal
    ~ how does the Slashdot readership fare when it comes to EPA sticker vs actual experience ~?

    The slashdot readership has probably faired the same since this story originally ran [slashdot.org]. Oh, wait.

  • My Hybrid Civic (Score:5, Informative)

    by EEBaum ( 520514 ) on Tuesday June 29, 2004 @10:01PM (#9567444) Homepage
    My '03 Hybrid Civic had (I think) 48/47 on the sticker. When I drive it, the "MPG" meter in the dashboard ends up around 42-46. At the pump, I actually get 39-44.

  • How the English improve their MPGs (Score:5, Funny)

    by NewtonsLaw ( 409638 ) on Tuesday June 29, 2004 @10:01PM (#9567448)
    You Americans could learn a lot from the rest of the world when it comes to getting more MPGs.

    Just do what we do -- use a bigger gallon!

    Low-tech solutions to hi-tech problems :-)

  • Author fails to realize one thing.. (Score:5, Insightful)

    by sinner0423 ( 687266 ) <sinner0423@@@gmail...com> on Tuesday June 29, 2004 @10:13PM (#9567528)
    Toyota doesn't mess around. They've also sold [iht.com] the hybrid technology to ford. Let's not forget that toyota is also releasing a hybrid [auto123.com]which does 0-60 in 4.03 seconds and tops out around 155mph. Don't walk away from this thinking Toyota is maniacally evil, if anything, they've got their shit together more than most automotive companies.

    Sorry for being a toyhead, they please [mr2.com] me [toyota-supra.com] immensely. Something tells me, if the author of the article was driving a volta, miles per gallon would be the least of his worries. I think toyota pretty much tops the list of fuel economy, on any playing field. Prius wins in my mind, not strictly because of fuel consumption, but by the name that's behind it.

  • 02 Prius (Score:5, Informative)

    by Technician ( 215283 ) on Tuesday June 29, 2004 @10:25PM (#9567603)
    In cold weather the Prius got between 35-40. Now that the weather is nice, I've been getting 48-52 for my commute. My wife who does more short trips and sits at lights with the AC on gets quite a bit less. The first 5 minutes in the Prius is very poor (about 25) as it is agressive in maintaining the engine coolant temprature for the low emissions. If it was designed for millage instead of emissions, it could do a lot better. Where the car does a fantastic job is in stop and crawl driving if you are not using the AC. It does that with the engine off 90% of the time. Conventional cars don't fare nearly as well as you are stopped too short to shut off the engine and sitting idling is zero MPG. An extra bonus is the car doesn't overheat in those conditions like my old car did. A warm day and stop and crawl traffic would usualy result in some loss of coolant.

  • 50 MPG Jetta TDI (Score:5, Interesting)

    by david_594 ( 735508 ) on Tuesday June 29, 2004 @10:26PM (#9567622)
    I drive a 2000 Jetta TDI, and I am no light foot with it. The EPA rating for the car is 42/48 and my personal lifetime average for the car is currently at 47.1 MPG. On longer trips of predominately highway i have had mileage about around 52-53 miles per gallon, this is with cruising at 70 mph. Got to love driving a diesel car :)
    • "On longer trips of predominately highway i have had mileage about around 52-53 miles per gallon, this is with cruising at 70 mph."

      You have to remember soemthing:

      Diesel has more energy per gallon than gasoline. Somewhere around 14% more, IIRC. So don't go bragging about your MPG figure until you realize that Diesel MPG != Gasoline MPG.

      Not to mention that diesel has a number of emmissions problems, particularly sulfur diesel (as is most diesel in the US). A vehicle like the Prius not only delivers higher

      • Re:50 MPG Jetta TDI (Score:3, Informative)

        by Anonymous Coward
        You also need to remember that the engines are different. According to Chevron (which makes both diesel and gasoline, so they really have no reason to fudge their numbers) and my thermo textbook diesel and gasoline are near-equal in energy per unit mass, but diesel is more dense and thus gets slightly higher energy density (114,200 btu/gal vs. 130,000 btu/gal; http://www.chevron.com/prodserv/fuels/bulletin/di e sel/L2_4_6_rf.htm)

        A significant reason diesel engines are more efficient is because their compre

  • MILEAGE DEPENDS ON FUEL QUALITY!!! (Score:3, Interesting)

    by foshizzlemynizzle ( 655903 ) on Tuesday June 29, 2004 @10:41PM (#9567728)
    While it is true that with age a cars mileage will tend to get worse due to carbon build up, what really effects your mileage is the quality of fuel that you use!! The higher the octane does not matter, but which brand most definitely does. For instance, at the risk of sounding like a corporate sponsor, Shell gas on average gives me about 30-40 more miles per tank than most gas.

  • Corvettes (Score:5, Informative)

    by sik puppy ( 136743 ) on Tuesday June 29, 2004 @10:59PM (#9567823)
    My 90 ZR-1 was stickered at 16/25. I got 18 city, and from 27 (80mph) to 33 (65mph). Not too shabby for 375 hp.

    Its replacement, a 2004 Z06, is stickered at 19/28 and I'm seeing 18.5/33-35 quite respectable and 405 hp to boot.

    I love it when some econo-box criticizes my sports car as a gas guzzler and finds out I get better milage than they are :)

  • My Jetta TDI gets 54 MPG on the highway (Score:4, Interesting)

    by trh ( 20778 ) on Tuesday June 29, 2004 @11:04PM (#9567852)
    My diesel 2001 Jetta TDI gets about 54 MPG for highway driving (doing 75+ MPH), and about 48 MPG in the city. It has 90,000+ miles on it, and still drives like a champ. Plus, diesel prices fluctuate less than gas does.

    Before people start to complain about environmental concerns, do the research first.

    http://www.tdiclub.com/
    http://www.biodiesel.or g/

    I did a lot of research when I bought, due to my long commutes (150+ miles/day), and I save, on average, between $250 - $300 per month, which essentially paid for the monthly payments.

    Great car. They also have Diesel Golf, Beetle, and Passat models, if the Jetta doesn't float your boat. Worried about not being able to find diesel? When my low fuel light comes on, I still have a 2 gallon reserve, or about 80 miles in the city, but in reality, it's not that difficult to find diesel.

    They're definitely worth checking out. I plan on being able to keep the car for a number of years, as the engines last forever. Sorry to sound like a diesel advocate, but it's a great, comfortable car.

  • I drive a 1994 Audi 12V V6 (Score:3, Interesting)

    by LighthouseJ ( 453757 ) on Tuesday June 29, 2004 @11:41PM (#9568064)
    it's the 90CS Quattro Sport, 5 speed. The car itself weights just shy of 3500 lbs, and then there's occupants. I'm still amazed at how agile it is with all that weight being pulled around by a 2.8L engine. The AudiWorld page [audiworld.com] for my particular car says 19mpg city, 24mpg highway but I can get closer to 30 in the city if I manage to not do craziness around town. I tend to shift at lower RPM's, I catch some flak for it but I go to the gas pump half as much as they do.

    Everyone that's driven this car is very surprised because it doesn't look like much but it can handle the rice boys fine. If it's in anything except clear conditions, don't even try. You've never lived till you spin all 4 wheels on gravel or ice while it gets grip. I can't imagine what putting a supercharger on there will do. I've had the car for over 2 years and I still get goosebumps from the performance.
  • The reason most people don't get the advertised mileage is because they goose it at most every opportunity and race up to the light and then get on the brakes. More sensible driving patterns will get better mileage. I like the hybrid cars because they provide real time feedback both in text and graphics as to your mileage and fuel consumption. I wish conventional cars would do this also.

  • I Love My Bike. (Score:5, Informative)

    by Hank Reardon ( 534417 ) on Tuesday June 29, 2004 @11:50PM (#9568104) Homepage Journal

    I'm riding a Honda Rebel around town now. The car I replaced with the bike was a 1992 Toyota Corolla that pegged in at about 30 MPG on the highway and 21 on the city streets. Since most of my driving was city streets, I'd have to fill up every week or less, depending on the travel schedule. The cost of gasoline now would make my average trip to the station about cost between $25 and $50 per week, again depending on how many times I needed more gas.

    I've had the bike for about 2 months now, and I think I reached $50 total in gas this weekend. I haven't figured out the total mileage yet; when the tripmeter reaches 150 miles, I get paranoid that I'll have to cut in the reserve (2.1 gallons in the primary, .6 in the reserve) so I fill up. I always go in and put $5 on the counter, fill up the bike, and go back and get my change. I'm guessing that I'm hovering around 80 MPG.

    And I'm getting a tan while I run errands.

    • Re:I Love My Bike. (Score:3, Insightful)

      by tehcyder ( 746570 )
      And I'm getting a tan while I run errands.
      As a fellow biker, I can tell you that this is the least sensible reason I have ever heard for riding.

      Your fine tan won't last long if you slide down some tarmac for a few yards.

      Unless you just mean tanning your face, of course.

  • My mileage (Score:4, Insightful)

    by Bombcar ( 16057 ) <racbmob.bombcar@com> on Tuesday June 29, 2004 @11:55PM (#9568134) Homepage Journal
    My preferred method of transportation gets 1.2 gallons per mile [toltecimages.com]....

    Which is better than a hybrid car [trainweb.org] for certain numbers of people.....

  • Driving Habbits (Score:5, Insightful)

    by NetMasta10bt ( 468001 ) on Wednesday June 30, 2004 @12:00AM (#9568171)
    I drive a 2001 Audi S4. It has a V6 twin turbo manual 6-speed. EPA says 17 city, 24 hwy. I drive mostly highway. During the summer months here in FL (lots of A/C), I tend to get around 20mpg average with my normal, very aggressive driving.

    Altough, around 2 months ago I performed a 'test'.

    During the whole tank of gas, I accelerated as slow as I could never pressing the gas more than 1/4 of the way. I knew the lighs were going to turn red, so why accelerate? I eased on slowly and came up to the red using as little break as possible (a waste of energy)... maybe even rolling into the light as it would turn green and _then_ slowly accerlerating.

    On the highway, I would stay in the right lane (insane for me). The speed limit is 70, but I would hold 63.

    For the tank I averaged 35mpg.

    Moral of the story. The car you choose does have a lot to do with your final MPG. But your driving habits also have a huge amount to do with your fuel usage.

    • Re:Driving Habbits (Score:3, Informative)

      by Fortress ( 763470 )
      Somewhat counter-intuitively, gradual acceleration is not the ideal fuel economy move. According to a BMW study, accelerating smartly gets you into a higher, more economical gear more quickly and reduces the engine's pumping losses due to partial throttle.

      The catch is, there is only a benefit if you accelerate no more than necessary. Thus accelerating quickly on a highway on-ramp yields a gain if you stop at the same cruising speed. If you streak from stoplight to stoplight, you only waste fuel reaching an

  • A few tips on improving your fuel efficiency: (Score:3, Insightful)

    by MtViewGuy ( 197597 ) on Wednesday June 30, 2004 @12:07AM (#9568203)
    1. Check your tire pressure at least once per week, preferably before you drive the car for the day. If the tires are properly inflated, you get lower rolling resistance, which can improve fuel efficiency as much as four percent.

    2. Change the air filter once every three months. With a clean air filter, you get better engine breathing, which can improve fuel efficiency several precent.

    3. Keep the fuel-delivery system clean. That means you should run something like Chevron's Techron additive to your fuel about three times per year to keep the fuel injectors clean. Also, consider having the fuel injectors removed and cleaned manually by a good auto repair shop every 36,000-40,000 miles or so. A dirty, potentially-clogging fuel injector can not only hurt fuel efficiency, it also hurts overall engine performance, too.

    4. Replace the spark plugs at slightly shorter than manufacturer-recommended intervals. An improperly-working or worn spark plug can hurt fuel efficiency and overall engine performance quite a bit.

    5. Don't drive too fast. Keeping the speed under 75 mph usually helps fuel efficiency since you're dealing with less air resistance when running at lower speeds.

    6. Keep the windows closed on a sedan or coupe type vehicle if you're travelling above 40 mph. An open window causes considerable air resistance at higher speeds, so much so that you actually use less fuel with the windows closed and the air conditioner running than having the windows open when you're driving on the freeway.

  • Economical? (Score:5, Insightful)

    by Captain_Chaos ( 103843 ) on Wednesday June 30, 2004 @01:13AM (#9568493)
    36.3 miles per gallon is the most economical mileage you got? And that's supposed to be especially economical? What kind of cars do you Americans drive?!

    I get twenty kilometers per litre, that's about fifty miles per gallon, on average, and that's with a very ordinary turbodiesel, nothing fancy or especially fuel economic (and a pretty quick driving style).

    • Re:Economical? (Score:4, Insightful)

      by daveman_1 ( 62809 ) on Wednesday June 30, 2004 @02:32AM (#9568828) Homepage
      What type of car do you drive and in your book, does a gallon equal 128 fluid ounces? On a separate note, Americans drive whatever car they like best. Sometimes it is a compromise of bang for the buck or practicality, but it will almost always be something that fits the driver. For instance, I just ordered a Mini Cooper S for my wife. The car's style fits her like a glove. The fuel economy of that car is just fine by my budget. I feel bad for people whose primary concern in owning a car is its fuel economy. There is more to life than efficiency.

    • Re:Economical? (Score:4, Insightful)

      by zakezuke ( 229119 ) on Wednesday June 30, 2004 @04:17AM (#9569122)
      And that's supposed to be especially economical? What kind of cars do you Americans drive?!

      Ummmm, gasoline powered cars for the most part, and it's practicly impossible buying a new car with anything smaller then a 1.5l. Even Honda's new civic is a 1.7l. Some states can't sell TDI cars, only a handful IIRC.

      Now, TDI would be nice, but let's look at the numbers.

      A Volkswagon Bettle GL 5 speed runs $17,630 MSRP [vw.com]according to the website. Toyota has the Echo and Corolla at $10,870 and $14,195 [toyota.com] respectivly, a price diffrence of $6760 and $3435.

      Corolla and Echo get about the same MPG, about 40 or so, you get 50 or so. Driving 300 miles a week for 52 weeks = 15600 miles. At 50mpg that would be 312 gallons of fuel, where 40mpg would be 390 gallons of fuel, a savings of 78gals a year using my numbers.

      At present fuel for me costs about $2.00/gal. I would save $156 yearly on the TDI Bettle. It would take me 43 years to see a cost savings in the echo, 22 years in the Corolla. This is assuming I pay sticker price for a base model.

      I'm not saying a TDI wouldn't be cool, it indeed would be. And 50mpg would be pretty cool too, but I have to look at the bigger picture here. The amount of money I save isn't enough to justify the purchace, and i'm a cheep bastard. I know many people, friends and family alike that drive SUVs or Trucks that get 12-15mpg. This is the 5+l engine class and is generally accepted as being piss poor.

      Between 30-40mpg is considered to good to great, and it is for gas powered cars with 4cyl sub 2.2l engines. 40-50mpg is considered to be excelent but none too common in gas powered cars. 20-30 is probally about average IMHO, esp among midsized cars, esp those with v6 engines in the 2.5l range.

    • Re:Economical? (Score:5, Informative)

      by mwillems ( 266506 ) on Wednesday June 30, 2004 @06:35AM (#9569480) Homepage
      Well, come on, I use 15l/100km, and that's driving a European vehicle. Driving a heavy SUV and carting around heavy stuff all the time talkes fuel.

      Note that US gallons (3.6l) are different from imeperial gallons (4.5l), so that can lead to some confusion between UK and US posters!

      MW

  • I live in the EU, you insensitive clod! (Score:3, Interesting)

    by Zog The Undeniable ( 632031 ) on Wednesday June 30, 2004 @06:46AM (#9569512)
    But seriously, we have urban, extra-urban and "combined" mpg. I find that I get almost exactly the "combined" mpg from a car once it's been run in, and I don't do many long trips. On long trips the mpg is quite close to the extra-urban rating. The EU measurements are actually very good compared to the pointless "constant 30mph/constant 56mph/constant 70mph" figures that were used in Britain until about 10 years ago.

  • True fuel efficiency means... (Score:3, Informative)

    by JollyFinn ( 267972 ) on Wednesday June 30, 2004 @09:07AM (#9570536)
    In Finland we have SUBSTANTIAL Gas tax. That means MPG has real result in my pocket.
    BAD MPG is from 70's soviet union made vehicles which is about 30 MPG and modern cars get around 60-70MPG. We pay 1.2 Eur/litre =~ 5.67$ /gallon. Most of it taxes.
    If US would get anyway near similar TAX on gasoline [Passed with reduction of other taxes] Your thinkin 30MPG is good fuel economy would change. Also that would bring small shops closer to places where people live in order to reduce driving.

Slashdot Top Deals

Technology is dominated by those who manage what they do not understand.

Close