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I made mine a behind-the-grill block so as not to attract the cops' attention. I suspect it works almost as well as in front of the grill; that's what an aerodynamicist at the university told me, too.
The newer BMW's have automatic behind-the-grill block blinds that are at least 3 inches behind the grill, i.e. huge air pocket. It must work, though, or they wouldn't go to all the trouble.
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You ever notice that birds pulse & glide, too?
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