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What I wonder is why the stock body tested at 0.487. That's as bad as a VW Beetle, with much advantage in fineness ratio and overall shape. I suspect that a lot of the advantage is in the contour of the back half of the roof—lots of tumblehome and similar to the GM EV-1. aerohead reports 10% of his drag is from the rear-view mirrors.
Rear wheel spats: Increased downforce without increased drag is a win. Left on the table: A massive rear diffuser.
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