I run only E10 87 and store it at 1/4 tank over winter at 45F. No problems ever. I have Barricade fuel lines. Just did a 400 mile trip. No issues. Ethanol has an octane equivalent of 113. Great antiknock properties. No MTBE toxins. Yes slightly less calories. But I can run more timing than with 87 E0. People used to love alcohol. It was sold as HEET. They would pay money and then pour it in their tanks. Nonsense that E10 is THAT bad.