Pillow's have always been my bug bearer as well. Usually end up with rolling half my clothes up in something and using that. 25 quid to put my head on something soft is a bit strong. You can get a cheap foam pillow that is more or less one trip and chuck away for about a £5 if you look round the cheap shop's. But that takes space.
To buy petrol in Europe. Pull up at station. Wait. Get out a 20 Euro note, then ask someone to fill up the bike. Give person money. Ride away. Simple.