Any 10% nitro with 16% or higher oil content w/caster blend BUT this is something that can be had much cheaper from a local hobby shop, even if you have to travel a little ways to get it.Omega, Byrons,Wildcat,Cool Power, ect...all good.
You should be able to buy it at $20 per gallon or less, And you can burn through a gallon pretty quick so get a couple.Our club will be placing fuel orders soon and if I buy a case, 4 gallons, the price is about $12 a gallon.