I live in the Midwest and we have had ethanol for years. We do have a choice at the pump between 87 octane(no ethanol), 89 octane E10, and 91 or 92 no ethanol. I can tell you that I have had no ill effects from using 89 octane E-10. I use it 90% of the time. I see no differences in power or in economy between the two. The E10 is 10 cents a gallon cheaper.