The practice of putting ethanol in gasoline shows how stupid our government can be. Every study I have read is that it takes more fossil fuel emissions to produce ethanol than we save by using ethanol. It is a zero, or possibly a negative improvement on the environmental front. The whole thing is a money making racket set up by the farming lobby under the pretense of being environmentally friendly. I am all for being environmentally friendly, But phony solutions such as this are so maddening!
But as far as fuel stabilizers goes, I noticed years ago that the fuel in my 2 stroke motorcycles stored better over a winter than the fuel in my 4 strokes. If you are going into a situation where you are going to let a gas engine set for a long time I would recommend that 1) you use a ethanol free gas, and 2) put just a little 2 stroke oil in the gas, even if its a 4 stroke. Not much, maybe 200 to 1 ratio. I have no proof this is better than a stabilizer other than the fact I have done this for years in my small engines and motorcycles and have never had a springtime fuel problem since I started doing it. If you are storing the engine for over a year, I'd figure out a way to run all of the gas out of the carb. Gasoline stores much better in either a full vented tank or an air tight tank than in a carb or a partially full vented tank.
It is true that running E10 isn't a problem in a modern automobile engine designed to use E10. Fuel injection also reduces the big problem of carbs gumming up. But E10 doesn't store nearly as well as E0 because of pre-mentioned water absorption. No stabilizer of any kind is going to help solve that problem.