There is a trip average MPG and a general average MPG. I reset the trip average every fillup, but leave the general average alone. Trip average is on my primary screen, general average is on one of the others (that I don't look at often).
So, when I'm done filling up, I do "Reset All Trip" and "Full Fill Up", write down the trip/odo readings on the receipt, clear trip odo on the dash, and head out
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