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I can try: upper the car the pressure is lower of lateral area (comprehensible?).
Causes this pressure difference, (in my mind), the air come from lateral at upper of car (probably little quote of air flux).
This diverted flow is cause vortices and induced drag.....it is an ipotetical opinion and I whonder an opinion for this one.
Similar case, is the deviaton flow from lateral at the car underbody
thanks
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