i would not say that odonell is the best.although it is good.you might want to try sidewinder fuel.it is great and offers good protection for the motor.a lot of pro drivers are runnin it.and that is all i will run now my self is 30% and i did not have to shim the head up. that is with the stock .26. now if you have a .21 then you will[sm=thumbup.gif]