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http://www.autoblog.com/2009/10/22/mythbusters-golf-ball-like-dimpling-mpg/#

The show's team completely covered a last-gen Ford Taurus with modelers clay and figured out that it would achieve about 26 mpg at a constant 65 mph. They then went about adding over 1,000 dimples to the car's exterior. To keep the experiment consistent, all 1,082 dimples removed from the clay exterior were put in a box and set in the back seat so that the car would weigh exactly the same as before dimpling. The theory is that, like a golf ball, the dimples would reduce the car's drag through the air, thus allowing it to travel the same distance at the same speed using less fuel. The result? Over 29 mpg.
Full video is in the link, here's a preview

http://www.youtube.com/watch?v=CPe1kk8A65g
 

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I wonder how many times they did the experiment. How did they measure fuel consumption? I'm surprised that the dimples would be scaleable from golf ball size. And wouldn't the dimples on the top creates some lift at highway speeds? This would be bad.
 

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I really like the show but they're special effects experts...they say they do plenty of stuff that isn't aired and helps explain things but still...if this really does work I wouldn't mind having it on my car.
 

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i remember hearing about some company making a roll on vinyl dimple sheet so you could apply this to your car... i forget where but i think it might have been popular science (the magazine). so it really does work and there are companies out there looking to do this for cheap.
 
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