Why is anyone using liquid preservative sin their gasoline or diesel?
I just calculated how long it will be before I re-fill the tank on my motor home.. And added 2 cans of SeaFoam to the tank to prevent fuel breakdown since the idiots in Washington DC insist they put booze in the gas and boozed gas breaks up faster than pure stuff.
Does this answer your question, You should be adding Seafoam or ETOH rathed Sta-BIl (I have used Sta-Bil in the past but these days I'm reading bad things about it) if you are not going to be filling for months on end. With EtOh adultrated fuels, I'd say 3 months pure six.