Talking about chainsaws and emergency use, my brother got the tip (living in the Florida Keys) to buy premixed canned gas. Feel free to use regular mix gas when you're doing a lot of cutting, but if you're not going to cut often, but need it to start on the first pull after a hurricane, drain the gas after use and keep one or more sealed cans of gas. They last in the high humidity indefinitely until opened and that is what counts when stuff is mission critical. True, I think it is more than $20 per gallon, but when you're in disaster recovery mode, do you really care about that or would you rather take everything apart, rebuild the carb and hope that your gas supply of mixed fuel didn't absorb too much water.
I have debated buying a can myself, but the reality is that we don't typically have emergency level issues. Having said that, not being prepared will be a pain if a big deal does happen. . .
I do only buy non-ethanol fuel for the mowers and I do put in fuel stabilizer in the winter.
He has also switched to only buying 5 gallon drums of VP racing fuel for his racecar. Buying a 55 gallon drum is cheaper, but it does absorb water/rust internally if it isn't used quickly. Costs more per purchase, but not clogging a fuel filter and leaning the motor out pays for the difference pretty quickly. He's amazed at the guys buying pump gas and the number of problems they have compared to himself.