Gas Pump Tip #1: Fill up your car or truck with gas in the early morning when the ground temperature is still cold. Gas stations have their storage tanks buried below ground, and the colder the ground, the denser the gasoline. As it gets warmer, the gasoline expands, so if you buy gas in the afternoon or in the evening, the gallon you pay for is not exactly a gallon. This is because gas stations don’t have temperature compensation at the gas pumps to adjust for the specific gravity and the temperature of the gasoline, diesel or ethanol. Every one degree change in temperature can make a big difference in your overall fuel costs.
Gas Pump Tip #2: When you’re filling up your fuel tank, don’t squeeze the trigger of the nozzle to the fastest mode. The trigger has three settings – low, medium, and high. Use the low (slow) mode to minimize the vapors that are created while you are pumping. All hoses at the pump have a vapor return. If you are pumping on the fastest mode, some of the liquid fuel going into your fuel tank becomes vapor. This vapor is then sucked up and back into the underground storage tank via the vapor return. You’re getting less value for your money since the pump registers the dispensing of the fuel but not the vaporized fuel that comes back out of your fuel tank and returns to the underground tank.