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I have been pondering the same thoughts as in #199 when looking at the GM EV-1. The rear glass slopes much faster than the "Template" looking from the side, but it tapers in also when looking from above. One would guess the air which "follows around" from the side, helps "fill-in" what air may try to separate while coming over the top.
With the flat sides on a pick-up bed, and the cap tapers in at the rear, I would think the air around the cap would "want" the air along the side to come up and join it. When the bed edge is square that air cannot make a smooth flow up to the cap area, which probably causes the vortices and the less than ideal gains from the tapered cap.
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