Where do you put your helmet ? (ooer!)

[Lawrence]

Is it really that much hassle to take off your helmet to go and pay for some fuel?

Yes, it is!  If I take my lid off then I need to re-do my balaclava, which means taking both gloves off (instead of just one) and undoing my jacket.
Fortunately the petrol station I try to fill up at (it's 3-4p/litre cheaper than the others on the way home!) don't care if I keep it on.