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It really doesn't matter very much whether you top off the tank or not, as long as you are reasonably consistent. Fill the tank till the nozzle shuts off and call it good; fill it to the next convenient unit of currency (dollar, in the USA); or waste time trying to get the very last drop in the tank. It will all average out within a few tanks anyway. Your day-to-day variations in driving, the weather changes over even a few days - or worse, over a month - will have far more effect. Seasonal variations in fuel mix, coupled with the uncertainty of what you get (is the service station tank all winter blend, all summer blend, or some unknown mixture? how much ethanol is in it?) make a variation of a fraction of a gallon unimportant.
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zeusstx 
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