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Proper recording of your MPG is a very specific thing.... You have to use the same pump every time (because different sloping concrete at different stations will give a different level of full). You have to fill up each tank to the top in order to be consistent, no amount of watching the gauge will give you accurate fill levels. Choose something like the second click to get a full level. (first click often goes off pre-maturely due to splash up.) When you do that, then it's the only way to make sure you have a consistent fill up, and so the only way to know how many gallons you used. (You can look into my log for my Thunderbird (wench) and see how much a differently sloping lot can affect your supposed MPG)
Always reset your trip odometer at the pump too.
If you can't afford at a time to fill up your tank, don't reset your trip odometer, just record the gallons you put into your tank, and add those to the sum of when you can top off the tank. (If you look in my logs, you'll see me putting 25+ gallons into an 18 gallon tank. That's how.)
But, when you do that, then you can start giving hard numbers that everyone on the board will be far more inclined to believe. Estimations and calculating gallons used by the gas gauge never works to the guys here.
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