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. 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 other 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
for your money.

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One of the most important tips is to fill up when your gas tank is HALF
FULL or HALF EMPTY. 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. 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 some of the dirt that normally settles on the bottom.  Hope this will
help you get the most value
for your money.

DO SHARE THESE TIPS WITH OTHERS!