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It's not good to try to get every last drop into your gas tank because you're just putting it into the evap system which is designed for vapors, not liquid fuel. It's not good to let your tank run empty because the fuel pump in the tank needs to have fuel around it to keep it cooled. Trying to get the most out of each and every tank is not a good practice. Getting the best fuel mileage doesn't have anything to do with overfilling your tank and then running it empty. Just write down how much you put in, and how many miles you've driven, and keep track over a long period of time.
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