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Actually, ebouwman, I think that wing on your car might be doing some good. It's hard to tell without a profile pic, and the only reliable way to know is by experimentation, but if that wing is catching the stream of air coming off the roof of the car, it will be helping to separate it cleanly from the car, rather than dragging it into the car's wake. It's less than the 30-degree angle aerohead quoted. I'd try some A-B-A-B testing, if you can, before conclusively claiming one way or the other.
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