How fuel stabilizers work...or not

I have been using Sta-Bil Storage for years in my ATVs, weed whackers, garden tractor, Toro ZTR, chain saw, and rototiller for years.
No problems. They all run on 87 octane 10% (more or less) ethanol.
In my experience, Sta-Bil Storage works just fine, at 2 ounces plus a little in 5 gallons of gas.
It is working for me.