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I'd try to copy the slope of the rear window on the Prius, more or less. The steeper and longer you can make it, the smaller the wake from the kamm back. Provided it is not so steep that you get separation, which will depend on how much turbulence is generated farther forward. It might be worth leaving the new rear window adjustable for a few runs to find the sweet spot. A kamm back is not a substitute for a long tapered tail, it is just a better compromise than a short taper or rounded tail.
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There is no excuse for a land vehicle to weigh more than its average payload.
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