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Old 01-17-2011, 01:36 PM   #8 (permalink)
ConnClark
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Join Date: Jun 2008
Location: Richland,WA
Posts: 985

Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

Gentoo320 - '04 Mercedes C320 4Matic
90 day: 22.44 mpg (US)
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Are you sure that your right foot hasn't gotten heavier with the new muffler? When I threw a cherry bomb on my car my mileage dropped because I couldn't resist the feeling of power that more boost sooner brought. After the novelty wore off my mileage improved. Less back pressure should improve mileage for the same power output at the crank unconditionally.
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