The only things that will really determine what octane you need are going to be your compression and timing. Some motors are designed for the higher octane fuels, like the ProXS. If you run a higher octane than what your motor is designed for, you are going to have more unburned fuel each time your spark plug fires, versus if you were running the suggested octane. I believe that will actually lead to more carbon build up and a bigger than necessary hole in your wallet.
Last edited by pbmang; 08/21/13 02:57 PM.