How to maximise filling your vehicle with petrol

I received this in my email today so I thought I will share it with all of you in this day of high petrol/gasoline price!

Tips for filling your vehicles:

1. Only buy or fill up your car in the early morning when the ground temperature is still cold.  Reason:  All service stations have their storage tanks buried below ground.  The colder the ground, the denser the fuel, when it gets warmer petrol expands, so buying in the afternoon or in the evening  .... your litre is not exactly a litre
2. When you're filling up, do not squeeze the trigger of the nozzle to a Fast Mode.  Reason:  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 for your money.
3. One of the most important tips is to fill up when your tank is half full.  Reason:  The more fuel you have in the tank, the less air occupying the 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.
4. If there is a fuel tanker pumping into the storage tanks, when you stop to buy, do not fill up.  Reason:  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.

Compiled by Ramesh Patel and edited by yours truly.