02-23-2009, 01:33 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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I'd bet my lunch that rear spoiler alone hurts Cd enough to show up in a coastdown or steady state MPG test.
The other add-on bits are probably neutral to insignificant, except the wheels, which look like air blenders.
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