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 the
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, where , every truck
that 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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