I was only wondering as I am want to do at times if there was a preferred method. I know every year at the end of the season i put fuel preserver into things like my chainsaws, mowers etc and run them until they starve of fuel and have no problem in getting them up and running in spring. I was not sure if between the devuil and the deep blue sea. Full tank no air but possiblity of petrol going off and empty tank full of air with its inherent moisture.
Will just bung a bit of fuel save in and leave her.