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If there is sufficient lift to affect traction then it would also reduce rolling resistance and improve gas mileage.
Answer me one question?
What speeds are we talking about?
I seldom if ever go over 65 MPH. Most cars have down force on the front and lift on the rear. You can also get lift if the bottom of the front of your car has a valence panel like the early Z cars which was a major contributor to the front end lift on that model.
Many cars had lower front valences that created lift, and air dams cured that poor design a long time ago.
regards
Mech
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