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Dirt on the back window isn't necessarily a bad thing from the aerodynamic viewpoint. Unless you want the car to be 10 meters long, you have to cut off the tail somewhere. Kamm worked out the math in the 1930s...

If you want to optimize your fuel economy, pump up your tires and drive more slowly.

by asdf on Tue Mar 6th, 2012 at 03:40:53 PM EST
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Of course, it's a bit lighter, too. Yes, I can get 48 mpg if it's a 55 mph limit, but it's probably not smart to go 55, when the tractor-trailers are going 62. Tires are at VW's recommended pressure. I'll probably stick with that.

paul spencer
by paul spencer (spencerinthegorge AT yahoo DOT com) on Tue Mar 6th, 2012 at 09:38:25 PM EST
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