Points of Disagreement:
a) As the tanks are stored underground, the temperature difference in the early morning or middle of the day would be worth nothing to you at the bowser. Dirt is an incredibly good insulator... just ask all the folk living underground at Cooperpedy!
b) 1 degree temp difference is a big deal for large quanties of fuel, but for 50-70L it wouldnt make much difference at all.
Points of Agreement:
a) pumping fuel slower would agitate it less, causing less vapours and less fuel leaving your tank as gas. (but then how much is your time worth to you)
b) keep your tank full. fuel does evaporate very quickly.... just listen to the air push out when you open the lid. (but again, how much is your time worth to you having to pull up and fill twice as often)
c) Never fill your car when a tanker is filling the station. All the crap at the bottom of the storage tank gets stirred up by the high pressures of the tanker pumping fuel in.
Oh..... and if you really want to be a tight arse, lift the fuel hoses after pumping to drain them into your tank for free fuel... although not really 'fair' for the next bloke :supersad:.