Like Tex said "ethanol in the fuel will not hurt your engine if you are jetted for it" and if the octane rating is high enough for your engine.

In the Phoenix area I have never seen more than 15% ethanol in the fuel unless it is e-85.  15% ethanol requires the jetting to be about 5% richer.  5% is equal to 1 to 2 main jets sizes.

E-85 needs to be about 30% richer on every fuel circuit including the fuel flow from the tank and into the float bowl.  E-85 can promote corrosion in the carburetor and inside the engine.