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Old 08-30-2010, 10:27 AM   #29 (permalink)
Phantom
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Location: Independence, KY
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Blue Meanie - '02 Volkswagon Golf TDI
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90 day: 48.52 mpg (US)

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This could be tested somewhat easily by running a gas powered generator with a pre-measured amount of of fuel. Warm up the generator let sit for ~5min run with 1/8gal of gas time from startup to empty, do the same with E10 and E85. Calculate the difference in time to get the change in FE, the FE will not be in mpg but idle run time.
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