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Rear Window Angle
As far as the sharp rear window goes, it probably doesn't do much to hurt you. In Hucho's book, you will see that drag goes down with a rear slope of up to ~15 degrees, then get's worse to ~30 degrees, and after 30, it GETS BETTER and stays flat from there on. So unless you are going to put a 15 degree trailing end on the car, try the spoiler idea.
*this is all from memory, so I will have to look when I get home, anyone feel free to chime in and correct me*
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