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Old 03-29-2012, 11:27 AM   #7 (permalink)
Aero Wannabe
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TDi - '04 VW Golf
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Originally Posted by Sven7 View Post
On wagons and fastbacks a diffuser at the wrong angle can increase drag. Assuming your car is about 0.3 Cd it is possible that a badly engineered diffuser could take away those 2mpg.
Good point. The angle may have been part of the problem.
60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun

Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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