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I think it's fairly clear that most of us can agree that any effect on FE, either positive or negative is quite negligible. That said, I'm actually considering putting some on my car. I have a WRX and the back window never has air flowing over it and it's annoying. I don't have any "wind" to keep it clear when it gets wet or snowy. I've been looking for something that might help with this problem, plus, I think the delta-wing type look kind of cool!
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