C5
The fore-body of the car is very good.It's long though,so frontal area doesn't occur until way back on the car.That means that there is little room for separation-free tapering to reduce the cars wake area,where most of its drag is.If you were dedicated to driving in an economical fashion,then some length of boat-tail is the only thing you could do for significant drag reduction.But if your going to drive it like a Corvette,you might leave things as they are,as directional stability at high speed would outweigh fuel savings.Looking at the Oldsmobile AEROTECH long-tail,Mercedes-Benz C-111 record car,or the GM EV-1 long-tail land speed record car will give you something to think about.
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