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The Honda CRX was a good example of a well-angled rear window that flattened out just before the back end. Without that detail, the flat back and wake could have been a bit smaller, but it wasn't done for styling, but in order to trip the air into a single large vortex instead of many smaller, random ones.
The best angle for the back window depends on how clean the shape is ahead of it. Turbulent air will follow a more abrupt shape.
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There is no excuse for a land vehicle to weigh more than its average payload.
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