1. Only fill up your auto in the early morning when the ground temperature is still cold. All service stations have their storage tanks buried below ground. The colder the ground, the more dense the gasoline. As the ground warms, gasoline expands, and so buying in the afternoon or in the evening... your gallon is not exactly a gallon.
2. When you're filling up, use the slowest speed; do not squeeze the trigger of the nozzle to a fast mode. The trigger has 3 stages: low, middle, and high. In slow mode, vapors created by pumping are minimized. All hoses at the pump have a vapor return. If you are pumping quickly, some of the liquid that goes to your tank becomes vapor and gets sucked back into the underground storage tank.
3. Most importantly, fill up when your tank is half full. The reason is that the more gas you have in your tank, the less air you have occupying the empty space. Gasoline evaporates faster than you can imagine.
4. Last, 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 more pours into the tanks, and you might pick up some of the dirt that normally settles on the bottom.
[Submitted by Jessica Ingraham]
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