Yup, the dealer called me back, and said John Deere won't warranty use of E85 in the tractor. Right now, it is still very new, but I'm thinking of getting one of the diesel minies. Price is just over $10,000. I like it better than the Kabota Mini, but the attachements for the Deere seem to cost a bit more. We'll see. I'm thinking of selling my motorcycle. I don't really ride it that much these days, and I can use the tractor more than a bike right now. Thanks for the response go-navy!