Assuming the rear of the vehicle (ground clearance at the rear) is greater than the front, a vacuum affect is created under the car. The venturi affect you asked about is part of the affect as well. This is something we did alot of reasearch on when doing ultra high speed competition with RC cars. These affects are exadurated on a small car at 100+mph speeds. These theories are easy to put to the test with our small cars.
Matt
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