Only buy or fill up your car or bike 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 fuel, when it gets warmer petrol expands, so buying in the afternoon or in he evening....your litre is not exactly a litre. In the petroleum business, the specific gravity and the temperature of the petrol, 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 they are filling up they actually 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 they should be pumping on
low speed, thereby minimizing the vapours that are created while they are
pumping.. All hoses at the pump have a vapour return. If they are
pumping on the fast rate, some of the liquid that goes to your tank becomes
vapour. Those vapours 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 tank is HALF
FULL. The reason for this is, the more fuel you have in your tank the less
air
occupying its empty space. petrol evaporates faster than you can
imagine.
Petroleum storage tanks have an internal floating roof. This roof
serves
as
zero clearance between the petrol 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 litre is actually the
exact amount.
Another reminder, if there is a fuel truck pumping into the storage
tanks
when you stop to buy, DO NOT fill up--most likely the petrol/diesel is
being stirred up as the fuel 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.
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