Just got an email from a mate that got it from a mate ect ect...
but it may be of help and may save you some $$$$
> TIPS ON FILLING YOUR CAR(S) (Good information)
>
> 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, LRP and
> Unleaded. We have 34-storage tanks here with a total capacity of
> 16,800,000 litres.
>
>
> 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 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.