Fill your gas tank in the morning or when it is the coolest. The gas doesn't expand as much when it is cool so you get more gas per gallon. That's why they say don't 'top off' your tank especially on hot days or it will come out of the gas cap if you fill up and just park the car.
I heard on the radio that filling up earley to get more gas is a hoax. They said that it may work in theory for huge amounts of highly heated asphalt on a road constuction project for example but the gas tank is too small and the temperature difference is not enough to make a difference.
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