EDIT: split/copied this post from another thread. Some gorgeous examples of aero engineering from the big auto makers...
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Some of the big auto mfr's compete every year in "extreme" downhill gravity races - and it's a really big deal for them.
Volvo
Volvo
Lotus
Nissan
Mazda
Audi
GM (Front)
Bentley
VW
Nissan (A winning team)
So ya, it's a big slap in the face. They know how important aerodynamics are - they're using it on downhill races where top speeds are ~50mph IIRC. Yet, bricks come off the assembly lines... Feel free to split this post off if you want...