FB is 100% correct. There is no purpose in running premium fuel in that sled. I would suspect that it is designed for 87 octane fuel, but I would run what ever the sled calls for. I can't remember an A/C 440 (other than a snow-pro) call for anything higher than 87 octane.
The sled motor is designed around a particular grade of fuel. Compression, cylinder temp, and other factors dictate octane required. If you run 93 in a sled made for 87 you are not only throwing money away, but you are also loosing power and economy by using a fuel that burns to cool and slow for the motor design.
If you raised compression, added a pipe, advanced the timing, or other mod that raises cylinder temp, then great, burn a higher octane, otherwise your fuel does not match your engine.