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I thought the reason a spoiler (can) reduce drag on (some) so-called "fastbacks" is that the lift generated by the attached air following the slope of the body created vortecies at the sides of the roof...and at some angle the benefits of filling in the vacuum behind the car (with air coming down over the fastback) were outweighed by the drag penalty of the vortexes (see, I can spell it either way). I don't have my Hucho handy, but I'm surprised the optimum angle is as low as 14 degrees...not the first time wind tunnel results have surprised me, but still.
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