I use ethanol gas in my 30+ year old chain saw, my trimmer, my leaf blower and my mower without any problems. I don't use the low grade as my Stihl string trimmer requires a certain octane which happens to be middle grade locally. I buy middle grade gas in a 2.5 gallon container and use it for all purposes, mixing it for the 2-cycle engines. I don't drain any of my gas powered tools and they sit in an unheated shed over the winter.
In the late 80's and early 90's, we drove a Toyota 4-Runner. Every 20 months I had to pay to have the injectors cleaned and it cost a couple hundred dollars. I asked my daughter's ex-husband (my daughter and her ex-husband both have degrees in automotive mechanics )what an injector cleaning kit would cost. He said about $300 but he recommended I fill my tank at Chevron and add some additional Techron gas additive to it. Then put it on the road until the tank was empty. I did it and drove from Lewiston, ID to Missoula, MT to Couer d'Alene, back to Lewiston. I did so and it remedied the problem. At that time, most Detroit auto manufacturers were putting pressure on the oil companies to develop top tier gas products. Since then, all the major brands have additives that work better.
I haven't had any problems with gaskets, seals etc. as a result of using gasoline with ethanol.
All gasolines aren't created equal, IMO and experience.
Ken
So much to learn, so little time.....