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Originally Posted by 3Hummer
i only filled my tank once and i only filled 19 gallons and it was empty so i thought the tank only holds 20, if its more then i got much worse gas mileage than i thought! Not good! And also when i fill my car it goes past full the needle shows like full plus 20 percent
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You divide the miles by the gallons required to fill the tank at that time, fuel mileage has nothing to do with the maximum gallons a tank can hold.