PS: Nephew is areo engineer for NASA at Langley. Works with their wind tunnel. Ask him about MythBuster show where they put golf ball dimples all over a car and got 10% better gas mileage. Ask why I would not put golf ball dimples on my C150.
Will not go into his whole explaination (which I did not really understand) but he said airflow around cars was much more turbulent than around airplanes, differnet drag aspects etc etc etc. Just because something works on a plane does not mean it will help a car and vice versa.
