Quote:
Originally Posted by tru
Tested a lawn edge Air dam 2 weeks ago and saw no appreciable gain and possible loss of mpg's at cruise. pics below of lawn edging.
the air dam has been cut to act as a deflector for both the front tires.
Also if you look close on the first pic you will see i taped the holes in my steelies, there was no gain noticed, however my wheels/caps stay clean much longer than they used to  |
FIAT's aerodynamics folks conducted wind tunnel studies and determined that on a car with a particularly well executed underside,that a front air dam could actually increase the drag.
This sort of thing is going to vary from one car to another.