last time i rode i ran 2 tankfuls through my sled, the first tank i ran sunoco ultra 94 octane, the second tank i ran mid grade 89 octane, and i saw no diffrance what so ever, i think they just want you to run gas with a higher octane rating than 87 or so the manual states, also they say stay away from white gas or methonal gas, lets face it most sleds are like 7or 8 to 1 compression ratio so gas dosent make much diffrance, maybe just a placeibo effect but me personally i noticed no diffrance one way or the other.
if its not a CAT, then it must be a dog!