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Actually, it depends on where the dimples are at. They need to be placed prior to the boundary layer seperation point. A golfball has them all over since a golf ball spins, and you don't know which part will be the point of attack when. The dimples cause the boundary layer to stay attached longer, thus reducing drag. Did you ever see the 'slice proof' golf ball? They filled in a certain portion of the dimples on the ball, the remaining dimples would cause the ball to right itself during flight, and go straight. Anyway, anything out away from the car body will help cause boundary seperation and induce drag which of course is bad for fuel mileage.
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