Old timer at some small repair shop told me to use the highest octane gasoline I could buy and never use the cheap standard grade gasoline (10% alcohol is BAD junk). The high octane gas keeps for SEVERAL months! I use this in my lawnmower, snow blower, generator and so forth. I know I can just walk up to any of the equipment and it starts on the 1st or 2nd pull.
I use the Stabil for many year, but found it to build up over time.
If it is already gunked up, it may not help. LOL