[MetroMPG]

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.