In addition to your comment, I haven't used my Alaska mill in awhile, but I ran a double 2100 bar on my mill, and the only gas available for awhile, was E85. I was really worried about having that fuel sitting in my equipment, or for that matter, even sitting in my fuel container.
My solution was, to add Amsoil fuel stabilizer to the mixed fuel, and that solved the problem. It stabilized the fuel well enough, that I used the fuel up long before it went bad and the water separated out.
I now have access to 90 octane marked gas (no ethanol), and I find that the fuel stays fresh much longer by using the stabilizer.
BTW: I ran my saws on the 100:1 Amsoil Sabre Two Cycle oil, and after using the saws for 10 years, I got an offer I couldn't refuse for the saws and bar. I got lonely, and replaced that setup with another pair of 2100s. I love those orange beasts.