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Old 06-22-2012, 07:15 PM   #2
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How do you know you used two gallons? Just by the fuel gauge? The fuel gauge is a best guess. Although, if you noticed the needle moved that much (about 2X) when it usually doesn't, could be something there.

Keep driving it until 1/2 to 1/4 tank, then refill and calculate the fuel consumption by hand?
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