ummmmm, i dont think higher octane gas would really give you more power and top speed. you run higher octane gas when you have a high compression piston. i have a 10.5:1 CP piston and i run 91 octane. if i am incorrect someone please let me know, but running gas that is a higher octane than needed is just flushing money down the toilet (or out your exhaust pipe). you wont get a complete burn. just like if you run too low of an octane you will get pinging and detonation which is not good either. what mods do you have on your warrior to get you up to 66.7? also, were you running on flat ground or down a hill? im not doubting you, just trying to figure it out for ya