Interesting that you mention E85. There isn’t much close to me, but I’ve been looking into it. What’s really strange is how viscous it is. It’s almost oily. I have no idea what’s in it (yet) that makes it so oily and viscous, but I do know it changes the tune up. By a quite a bit.
If you elect to run e85 on a carbureted application, you’re better off ordering a drum of e98 ethanol and blending your own fuel from there with non ethanol premium pump. e85 at the pump varies from 50% to 83% depending on the seasonal blend. Calculate Ethanol % of Mixture