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Old 06-23-2012, 04:56 PM   #7
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Join Date: Nov 2006
Location: Cucamonga CA
Posts: 3,687
Originally Posted by bar10dah View Post
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?
The only way to be sure is to divide miles driven by actual gallons used. Our gauges are flaky (to be polite).
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
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