Purchase your gasoline in the early morning or at night when it is cold outside. Gas becomes denser in cooler temperatures. Since gas pumps only measure the volume of fuel - not the density - you'll get better overall gas mileage for your money by purchasing fuel when it's cool outside rather than in the heat of the day.
If your car gets 25 miles per gallon, and each Lotto ticket purchased equals a gallon of gas in your car, it would take 730 round-trips to the moon before anyone won the jackpot.