Petrol Filling - Tips

I read in one of the junk mail about how to fills our car petrol efficiently. Not sure if it is true or not, but I think a trial won't cause us any damage, right?

Here is the tips :

1. Only buy or fill up the petrol early in the morning when the ground temperature is still cold. Most service stations have their storage tanks burieed below ground. The colder the ground, the higher is the density. Warm weather, petrol expands (afternoon/evening).
2. Do not squeeze the trigger of the nozzle to fast mode. In slow mode, vapours are minimized. If you pump the car on the fast rate, some of the liquid that goes into the tank becomes vapour. Those vapours are sucked up and back into the underground storage.
3. Fill up the tank when it is half full. Because, the more fuel you have in your tank, the less air occupying its empty space. Petrol evaporates faster that we could imagine.
4. Lastly, do not fill up your car if there is a fuel truck pumping into the storage tank. Most likely that the petrol is being stirred up and you might pick up some dirt that normally on the bottom of the ground.

Enjoy and have a try on it....