TIPS ON FUELING YOUR CAR from Sandy, via David.
I don't know what you guys are paying for petrol.... but here in Durban we are also paying
higher, up to R7.35 per litre. But my line of work is in petroleum for about 31 years now,
so here are some tricks to get more of your money's worth for every litre.
Here at the Marian Hill Pipeline where I work in Durban , we deliver about 4 million
litres in a 24-hour period thru the pipeline. One day is diesel the next day is jet fuel,
and petrol, LERP and Unleaded. We have 34-storage tanks here with a total capacity of
16,800,000 litres.
Only buy or fill up your car 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 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 vapours that are created
while you are pumping. All hoses at the pump have a vapour return. If you 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 
I'm not a driver myself , but I know many of you are 