The one really good thing about avaition 100LL is it has a shelf life of 18 months, it is what I try to use in my stuff that sits a lot between uses, pit bike, generator, lawnmower and so on up
The local pump swill has a shelf life of less than 90 days down

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)