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To put it another way, EVERY angled surface of a vehicle creates force in some direction, either up, down, left, or right. The question is whether it produces less rearward force (drag) than the alternative.
So what is the alternative to the downward slope of a "fastback" or pickup aero-shell? The alternative is a box shaped rear like my XJ's, a nice lift/downforce free surface, which is exactly what everyone here wants to get rid of because it instead creates a huge vacuum.
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