Ethanol when used in any 2 cycle engine will cause the engine to run cleaner, but it also will make it run hotter, not always a good thing.

Echo and several others have come out and said using E85 and E80 will void the manufacturer's warranty.

We have found even E90 with only 10% ethanol will lead to early engine failure.

When you mix your fuel use a 1 gallon oil mix and mix it 9/10of a gallon of  

to a 1 gallon oil mix