there is lots of different fuels out there. 1. i would see what your local hobby shop carries. availibity is important. 2. are u racing or are you bashing.3 read your owners manual. read the manufavtors recomendation... i race, i use byrons 25%. it has great power and has a good oil content to protect my engine.... other ones i race with have used cold fusion fuel and has had problems with the engine wearing out quick.. when choosing a fuel look at the oil % you want 12% plus or minis 1 . ive heard o'donnels is also a great fuel. ive used nothing but byrons in my force 28 and i run 4 gallons through it and it is still running great. my race engine is a mach 2 .21 on my 2nd gallon on it no issues. so i think im using the right fuel for what i am doing with it. but i would go with what is availible in your area. for bashing i woud just get the 20% nitro. i might try 30%next year.