Thread: flowmaster super 40... FE impact?
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Old 01-14-2009, 01:12 AM   #8 (permalink)
ConnClark
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Join Date: Jun 2008
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Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

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A reduction in back pressure will improve your mileage slightly. It may not be measurable however.
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