I've posted very many times that I run E85 in my non-flex-fuel vehicles with no modifications whatsoever. Sometimes the CEL comes on but since I know why, I ignore it. Only real issue is cold start in sub-freezing weather; I simply use E10 then, or if I'm making a long trip, I burn E85 on the trip then fill at or near the end of it with E10 for the next cold start.
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