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Old 03-11-2010, 04:16 PM
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d.delano d.delano is offline
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Join Date: May 2004
Location: DC
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To correctly determine fuel economy, fill your tank. Reset your trip odometer. Drive until you need to refuel. Fill your tank again, and divide the mileage on your odometer with the number of gallons it took to fill up your tank. The result is your avg. fuel economy.

Honest John's method includs a .22 multiplier to convert litres to gallons to arrive at MPG rather than LPG, so take note.
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