You can even run those engines without any nitro at all. They run very well without it and you don't need to worry about putting after run oil in your engines. Nitro is acidic, the more you use the more acid you put in your engines and the more you need to put after run oil in the engines. The pylon racing guys F3D manage to fly at over 350 kilometers per hour (thats over 220 miles per hour) without using any nitro in their fuel