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cbergeron: where do you get the idea that lowering doesn't improve aero? (Point to a credible source maybe?) It's accepted in practice & theory that it does help for the passenger cars I've seen it applied to.
coyote: underbody airflow is typically a lot less energetic by the time it reaches the back of the vehicle. More turbulence from all the bits hanging down & uneven underbody surfaces, so that behaviour is normal.
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