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Old 08-03-2008, 05:17 PM   #8 (permalink)
Bearleener
Efficiency freak
 
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Join Date: Mar 2008
Location: Berlin, Germany
Posts: 58

Frugolf - '96 VW Golf wagon
90 day: 40.36 mpg (US)
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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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