A close relative of mine who lives in California, plus is in the gasoline industry for 31 years, sent me this information regarding gas-saving tips. I felt this was really good information to share with all of my activerain readers:
GAS SAVING TIPS ON PUMPING GAS 
Only buy or fill up your car or truck in the early morning when the
ground temperature is still cold. Remember that all service stations have their
storage tanks buried below ground. The colder the ground the more dense
the gasoline, when it gets warmer gasoline expands, so buying in the
afternoon or in the evening....your gallon is not exactly a gallon. In
the petroleum business, the specific gravity and the temperature of the
gasoline, diesel and jet fuel, ethanol and other petroleum products
plays an important role.
A 1-degree rise in temperature is a big deal for this business. But the
service stations do not have temperature compensation at the pumps.
When you're filling up do not squeeze the trigger of the nozzle to a
fast mode. If you look you will see that the trigger has three (3) stages: low,
middle, and high. You should be pumping on low mode, 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
worth or your money.
One of the most important tips is to fill up when your gas tank is HALF
FULL. The reason for this is the more gas you have in your tank the less
air occupying its empty space. Gasoline evaporates faster than you can
imagine. Gasoline storage tanks have an internal floating roof. This
roof serves as zero clearance between the gas and the atmosphere, so it
minimizes the evaporation.
Another reminder, 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.
To have an impact, we need to reach literally millions of gas buyers.
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