Buy a gallon of coleman fuel from walmart for under $10. Mix your favorite oil and never worry about it again. Stuff can sit for years and your machine will fire right up.
The coleman fuel is liquid, found in 1 gallon metal cans. Both my toro commercial weed eater and Husq saw love it.
I love it as there's no ethanol and a shelf life that blows gas out of the water. Smells unique when burnt as well.
Hobby guys have been using it for years in their gas burners, as have I. No GAS smell on your machines either!