EARLY MORNINGBuy in the early morning when the ground temperature is still cold. The colder the ground the denser the gasoline.
FILL SLOWLY
Do NOT squeeze the trigger of the nozzle to a fast mode. The trigger has three (3) stages: low, middle, and high. In slow mode you should be pumping on low speed, thereby minimizing the vapors that are created while you are pumping. All hoses at the pump have a vapor return. If you are pumping on the fast rate, some of the liquid that goes to your tank becomes vapor. Those vapors are being sucked up and back into the underground storage tank so you're getting less for your money.
WHEN IT'S HALF EMPTY
Fill up when your gas tank is half empty. The more gas you have in your tank the less air occupying its empty space. Gasoline evaporates faster than you can imagine.
AVOID GAS DELIVERY
If there is a gasoline truck pumping into the storage tanks when you stop to buy gas, DO NOT fill up -- most likely the gasoline is being stirred up as the gas is being delivered, and you might pick up some of the dirt that normally settles on the bottom.
