O.K i got this in a e-mail does anyone know if there is any truth in this its from someone who has (allegedly) been in the petroleum business for over 30yrs:....this is just a snippet of what was written.
Only fill up in the early morning when the ground temp is cold, the colder the ground the denser the fuel becomes as when fuel is warmer it expands which means your litre isnt exactly a litre?
When filling up dont squeeze the trigger on fast mode...there are 3 modes. low/middle and high, we should be pumping on low as this minimises vapour loss whilst pumping,all hose at the pump have a vapour return, when in fast pump mode some of the liquid going in becomes vapour and being sucked up and back into the under ground storage tanks so getting less for your money.
Fill up when your tank is half empty, the more fuel in your tank the less air occupying the empty space, Petrol evaporates faster than you can imagine.