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I havent done sufficient testing to say that these gains are proven but previous to this spoiler my best average was 47.5 mpg. I ran two ABA tests early this morning before the wind picked up each one was 30 miles long total. I get my car up to 60 on the interstate and hit cruise and then reset my scangauge. Today my average over those two runs was 51 mpg. This spoiler sticks out 10 inches from my rear decklid.
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