I've gotten into the habit of just adding Stabil to my 5-gallon can when I fill it at the gas station. It doesn't hurt any equipment for it to be in there, and that way if I top off a snow blower, generator, or tractor, and it doesnt get used for a few months, there's no worry. Yes, I also only get non-ethanol gas too. I know this works well, as we had a brief power outage last month, and the generator that I hadn't started for well over a year, fired up on the first pull. I couldn't even begin to tell you when I put the gas in that generator, but I know it's been well over a year, since we moved last summer and I didn't use it at all in 2015. Anyway, I figure the Stabil is cheap enough that it is an easy insurance policy!