There's two ways to run E85, use spark ignition, or use glow ignition. Large gassers work well if you mix two gallons of gasoline with one gallon of 10%nitro, 10% oil glow fuel and run on glow plugs. Smaller engines can use E85 with glow too, some people power the glow plug continuously. I'm using spark ignition, the original carburetor, and 10% castor for lubrication on a Saito 120. I've run a .40 on E85 too. It doesn't yet have the same power as a glow fuel but I think a similar two gallon to one mix like the large gassers is where it's at. Except more oil is needed to lubricate the glow engines, especially the conrod bottom end. 10% oil is minimum for large Supertigre's. The gasoline in the E85 has more lubricity than methanol so less oil is required, but it's still 85% ethanol alcohol. I'd try 10% oil on a glow engine and watch the conrod carefully for egging and slop. Of course, it may just blow up.