Hey all, You are all talking about good fuel and I am surprised that no one has mentioned Wildcat fuels. In my opinion the best.
I have been running 30% in an RB x-12 Rody for probably 60 races. The engine always starts instantly NEVER flames out and has been very fast. I have only gone through 3 glow plugs in a year and a half.(MC-59) favorite none turbo glow plug. Until last week I had never taken the engine apart, and I let it sit for 5 months last winter with no after run oil and it has been sitting this year since October. No rust and only had residue on top of piston. It will take something very drastic to happen for me to switch fuels. I really enjoy not having to worry about my engine.