08-21-2008, 05:31 PM
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#4 (permalink)
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Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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The cardboard Kammback mockup/prototype was good for 2.3% better MPG @ 55 mph. The permanent one is both longer (ie smaller wake cross section) & better designed, so it's got to be better than that, but I don't know exactly how much higher.
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