My LHS sells one brand of fuel, S&W Race fuel. Its a 20% Nitro 20% oil blend and costs $16 a gallon. The owner/workers will laugh at you if you ask if "its safe" for this or that kind of engine. Hes a bit of an "old school" douche bag, but you can count on him for honesty. I run it and it works very well, I do think its a bit heavy on the oil but I've seen no adverse effects.