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- Fill up your car or truck ONLY 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 when buying in the
afternoon or in the evening . . . your gallon is not exactly a
gallon.
- 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.
- 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.
- 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 it is being
delivered, and you might pick up some of the dirt that normally
settles on the bottom of the storage tank.
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