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6. Do not fill your tank up completely.
Instead, keep it half full. Depending on your tank size, your car will have 50-100 pounds less to haul all the time... less weight, less gas.

7. Fill your tank at the coolest time of day.
Fuel is denser when it's cool in the early morning or late night.. Your engine consumes fuel by weight but gas pumps dispense fuel by volume. The colder the fuel is when you pump it, the more of it you get for the same money.