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Originally Posted by nevremj
If you consistently record fuel amount at each fill-up, then small variations in level at end of fillup are immaterial. ANy one fillup may vary quite a bit depending of the fillup level, is car on a slant etc. But such small variations will average out. One easy way to detect changes is to track fuel usage over the last five(or any other number) of fillups. If you see a change that is not weather related or explained by other reasons then items that affect fuel usage should be checked.
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I couldn't have said it better myself. I spent the better part of a day trying to explain to someone on another forum the merits of keeping a running average and they never did get it. I could never see why people were so anal about getting that last gallon in their tank, when if you just keep a running tally it is a mute point. Of course it isn't that difficult to top off the Mercedes, but to get the tank completely full on my Chevy pickup would take 15 minutes or more.