Don't overfill your fuel tank, but do try to keep it on the "high" side as a rule. A gasoline tank that's filled over capacity will slosh its load onto the street, and dribble when the liquid expands with heat. On the other hand, a fairly well-filled fuel reservoir will minimize evaporation losses. The best practice is to fill your tank up to the first "click" of an automatic fuel nozzle.
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