How to Get 76 MPG
We don’t need new technology to save us, just a little ingenuity.
After a few minor tweaks, Ernie Rogers can get up to 76 mpg in his 2003 VW diesel Beetle:
He drove 1375 miles…[on] just 18 gallons of fuel– 1200 miles of which was accomplished on just one tankfull (15.5 gallons). His trip fuel economy was 76 miles per gallon. Rogers’ car included several small refinements that added up to the exceptional mileage: a drag reducing device he designed and built himself (pictures [here]), lower-rolling-resistance tires, low-friction engine oil, and use of a B5 biodiesel blend fuel to increase efficiency and improve emissions.
That’s right, it’s a non-hybrid that puts the Prius to shame. Granted, this test was at 55 mph, but the VW still gets between 57-65 mpg at normal freeway speeds.
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What’s Ernie’s great innovation? His VW might not win a beauty pageant, but it gets the job done, and it’s based on a simple concept: reducing drag.
As explained on Ernie’s website, automobile drag occurs mostly at the rear, where the course of smooth-flowing air is disrupted. Think about an airplane wing, which reduces air resistance by by guiding it along the wing’s surface to a thin edge. Although the VW beetle might seem somewhat aerodynamic to the untrained eye, drag is produced as air follows the curve of the frame. To solve this problem and create smoother air flow, Ernie installed a homemade spoiler, improving fuel economy by 5-8%.
Add low-resistance tires, low-friction engine oil, and a lubricious fuel additive (biodiesel), and you’ve got major increases in gas mileage.
If a back-yard mechanic can do this, imagine what auto-manufacturing’s best and brightest (backed by $$$) could do.
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For more information, see the links:
Drive55.org: VW Beetle wins fuel economy prize: 76 mpg
Max MPG: Aerodynamic Modifications for Maximum Mileage
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December 12th, 2007 at 11:50 pm
Everything I’ve read says E85 is less fuel efficient, how does he explain his opposite theory?
December 13th, 2007 at 12:10 am
You’re right that E85 is less fuel efficient than gasoline, diesel, or biodiesel. In this case though, Ernie Rogers used a mix of 95% diesel and 5% biodiesel fuel. Diesel engines are typically more efficient than gasoline engines. Paired with the modifications above, they can be super-efficient. If you’re still confused about the differences among these fuels, see the Biodiesel Mythbuster: http://claytonbodiecornell.greenoptions.com/2007/04/05/green-myth-busting-biodiesel/
December 14th, 2007 at 8:19 pm
: How to Get 76 MPG – Gas 2.0…
We don’t need new technology to save us, just a little ingenuity.
After a few minor tweaks, Ernie Rogers can get up to 76 mpg in his 2003 VW diesel Beetle:
He drove 1375 miles…[on] just 18 gallons of fuel– 1200 miles of which was accomplish…
December 15th, 2007 at 12:16 am
[...] and now can get up to 65 mpg. According to Gas 2.0, sometimes that number gets like elevated at 76 mpg. These aren’t immutable results, but they are potential. up a long-distance (2,985 miles) [...]
December 15th, 2007 at 12:18 am
[...] the Bug) and now can get up to 65 mpg. According to Gas 2.0, sometimes that number gets as high at 76 mpg. These aren’t constant results, but they are possible. On a long-distance (2,985 miles) trip [...]
December 15th, 2007 at 12:35 am
[...] the Bug) and now can get up to 65 mpg. According to Gas 2.0, sometimes that number gets as high at 76 mpg. These aren’t constant results, but they are possible. On a long-distance (2,985 miles) trip [...]
December 15th, 2007 at 2:35 am
[...] the Bug) and now can get up to 65 mpg. According to Gas 2.0, sometimes that number gets as high at 76 mpg. These aren't constant results, but they are possible. On a long-distance (2,985 miles) trip [...]
December 20th, 2007 at 10:04 pm
Awesome.
“We don’t need new technology to save us, just a little ingenuity.”
There is more to the energy problem than just being more efficient in using gas. Reducing drag and making current cars more efficient is great to give us more time to solve the problem, but the fact is that there is only so much oil in the world and if we keep using it, we *will* run out. However, reducing drag is a great temporary fix, and it’s a great concept to carry into the future with whatever fuel we end up using.
December 27th, 2007 at 1:43 am
I love that people are comparing standards to the Prius; “puts the Prius to shame”. If the Prius were the bad car, life would be good.
A Prius owner.
February 14th, 2008 at 4:58 pm
[...] makes the 76 mpg VW Beetle hack look a bit paltry, it´s based on the same principles. Remember that by using a spoiler to reduce [...]
March 10th, 2008 at 9:00 pm
[...] Gadget) custom-converts cars for a living, but instead of tricking out cars to run on biodiesel or get better mileage, he’s hacking them to run on electricity. He’s the owner of Left Coast Electric, a [...]
May 14th, 2008 at 8:46 pm
[...] How to Get 76 MPG [...]
May 21st, 2008 at 5:35 am
Did anyone read his site? he only got 55.6 mpg, thats with diesel doing 65 mph. The old EPA estimate was 49 mpg which included slower speeds and w/out the air conditioning running. So while he did improve it slightly it is nowhere near 76 mpg.
May 30th, 2008 at 5:52 am
I aggree wtih the other guy there is only so much oil and we are going to run out someday no matter what. We need to get all of the big trucks off the road and start shipping stuff on trains again. and trains could be made tto run on nuclear power, and so could all off the ocean frieghters\ ships. and we need to do away with commericel air travel completly its just to much of a waste of fuel. and we need to learn to live on a local economy not a world economy ,and the stock market has got to go. imean I have traded stocks to but its stupid anyway. so just do away with it, and then we do have the option of using all of the corn oil soy oil and such to run our diesel cars and pickup trucks. and also dont forget the hydrogen we can make from electrolysis called browns gas to run our cars on demand , it works I have a 2 hp briggs engine running on pure browns gas made with water and baking soda. and 12 Volts 2 amps. almost free . my next step is to build a large browns gas or hho gas generator the will make enough gas to run a small 4 cylinder engine like the 1.0 geo engine this is do able and thats about it. I like the bug thig I have two vw jettas running on wvo And hho rigyht now. So people lets start thinking and put the oil companys almost out of business,
April 21st, 2009 at 5:13 pm
[...] was intended to maximize fuel efficency through minimal drag and light-weight materials. It has a drag coeffeicient of only 0.30 and weighs 1500 pounds less than a similarly-sized [...]
August 30th, 2009 at 8:12 pm
Very good design for a home-brew spoiler, it appears to be “done right.”
When smart designed the… umm smart series of cars, they kept a low profile front-end, but added a spoiler as part of the body design, even on their convertibles. There is no question, it works. In combination with an efficient turbodiesel engine, it can work very well toward meeting 70 mpg right off the dealer’s lot.