@ some_other_dave: I seem to recall a MythBusters episode where they couldn't perform an experiment requiring them to drop a car because they had been using FWD cars with unequal weight distribution. They then grabbed a BMW with a 50/50 weight distribution, and it was able to free fall without taking a nosedive. Maybe there is some other factor involved?
@ 300: Maybe, but yes, I'm sure the drag penalty for that design would be greater than either the Mitsubishi VGs or the other roof spoiler that he had pictured.
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