[aerohead]

for the golf ball,the dimples help establish a premature transition to a turbulent boundary layer and the attendent lower drag coefficient which accompanies the turbulent boundary layer. The Reynold's Number environment in which automobiles inhabit guarantees a turbulent boundary layer and lower and stable drag coefficient at and above about 20-mph.Dimpling the leading edges of a car will not lower its drag.---------------------------" Dimpling"or adding turbulators near trailing edges can and may reduce drag in some cases however are never used in the forebody.