RE: what brand nitro fuel?
If you can find it in your area try Maxy's Fuels. Awesome fuel I won't use anything else. I have run Byrons, BlueThunder, Cheap Traxxas, and now I run Maxy's. Cool temps and lots of power. Already have 2 gallons through my OS .21 TM and the motor has great pinch and compression. Also side note. I have run MotorSaver air filters on all my RC's and they work great. Never had an issue with them.