This is what my local Sthil dealer recommends to use in all small engines.
It's $8.95 a quart. + taxes.
A buddy says use #1 gas and put a cap full of the Aspen in the tank. Hmmmm
I used to just run #1 gas with Stabil but I had 12 gallons of it go bad in my black car. Only $600 damages from that adventure.
Mercury Outboards used to sell a fogging storage agent. You expose the carbs and spray the carbs with the fogging agent till the motor stalls. This coats the internal parts from corrosion over winter.
I'm running #1 gas in everything. What I can drain completely I will and then put a little of the Aspen in (weed whackers , or other small engines). Larger gas tanks like the cars I'll treat with Stabil and hope for the best. If I can get the fogging agent I'll try it also.