Never had a problem using it in small and large engines....If any one believes that producing ethanol hurts farmers and food markets, you're wrong. Ethanol production actually creates food products, more than you can imagine!!! How else do you think corn syrup, corn starch, maltradextrins, glutton meal, corn meal, etc are made? They coproducts of ethanol production. Ethanol from corn is a 0 waste process.