I spent two hours last night researching this and here is what i've come up with....
Ethanol will eat away at your fuel lines and carb diaphragms, gaskets, etc...not to mention it holds moisture.
So far i found a product that combats the moisture issue which is Ethanol Shield. As for the eroding fuel lines there are marine grade fuel lines that are ethanol safe. I believe you have to look for SAE J1527 type B fuel lines.
This is all i have so far, my Stihl equipment has held up good (other than new carbs every year) but i only run two days a week. I am buying all new equipment next month from mower to handhelds and no chance am i going to risk any carb issues.
Believe nothing that you hear, half of what you see, know that most people are idiots!
Barry is killing our Constitution