I believe you to be right about the plugs not liking the ethanol. Having said that, there is the Norvel GX .40 that runs on regular gasoline. I would assume it would work nicely on the E 85. Is that the smallest? I don't know. That motor uses a extra hot Turbo style plug, and a slightly reworked carb. I would get one, but think I have enough motors for the next 50 years, and the methanol glow fuel isn't too expensive, yet.