<FONT face="Comic Sans MS" color="#008000" size="4">Got this in my email today, and thought I'd pass it along, since the topic has been touched upon quite a bit....
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Only buy or fill up your car or truck in the early morning when the
temperature is still cold. Remember that all service stations have
storage tanks buried below ground. The colder the ground the more dense
gasoline, when it gets warmer gasoline expands, so buying in the
or in the evening....your gallon is not exactly a gallon. In the
business, the specific gravity and the temperature of the gasoline,
and jet fuel, ethanol and other petroleum products plays an important
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
mode. If you look you will see that the trigger has three (3) stages:
middle, and high. In slow mode you should be pumping on low speed,
minimizing the vapors that are created while you are pumping. All hoses
the pump have a vapor return. If you are pumping on the fast rate, some
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
worth for 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
imagine. Gasoline storage tanks have an internal floating roof. This
serves as zero clearance between the gas and the atmosphere, so it
minimizes the evaporation. Unlike service stations, here where I work,
every truck that we load is temperature compensated so that every
gallon is
actually the exact amount.

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
of the dirt that normally settles on the bottom.

Hope this will help you get the most value for your money.

<FONT face="Comic Sans MS" color="#008000" size="4">Karen Pierce
Stitching Blog: http://mystitchinaddiction.blogspot.com
View My Photos: http://community.webshots.com/user/karenpierce729