Ethanol is apparently highly hygroscopic. It has to be mixed with pipeline nearly “finished” gasoline at the distribution point.
For that reason alone I deeply dislike it.
Though ethanol is not nearly the toxic solvent that methanol is, it is just not energy efficient as an ICE fuel.
I’m sure that small engine manufacturers have addressed their gaskets/seals/valve and ring materials in later years.
For ojnly a few gallons/year, I see no need to do anything but buy non-alcoholic gas for those machines. I don’t drain, but top off the tank for storage.
I find my snow shovel starts up fine every time, no matter the temperature. And I don’t have to start up a vehicle to go the gym.
What additives would you suggest to replace it. It is the cheapest octane booster on the planet and rapidly renewable plus a feed and fiber source.