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      01-12-2014, 02:53 PM   #14
1fastdoc
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Drives: 2011 E92 M3
Join Date: Oct 2012
Location: Nashville, TN

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Most pumps are no longer mechanical but controlled by software. As such, it's possible to gouge but ensure the numbers even out at the obvious marks such as 1, 10, 20 gallons.

I wouldn't aim for exact numbers. Instead fill up and use a calculator. It's not that hard.