there isn't different fuel for helis, cars, and planes, there are different contents of oil (either/or synth or castor) and nitro. 40% nitro is very high and used in a couple racing cars, most helis use 30% on the higher end, but that works fine in most plane engines also. (i run coolpower 30% in my saito .72, spins a 15inch prop at 9000 rpm...)

anyway, airplane engines like from 15% oil up to 22% or so, heli run a little higher, 20%+.