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Anyone know what compression or compresion ratio that premium or 91 octane fuel becomes benificial to a 2stroke sled engine,such as 130 lbs compression or 12to-one compresion ratio I have heard from some sledders that on stock engines 91 or higher is not necesary beyond 4500 feet altitude

jaf I am new to this site, been snowmobiling since 1966,Started out with a ride on a 66 SkiDoo,bought a 1967 MotoSki zepher big power 22hp Hirth 372,Then1970 Skiroule racer340RTX, then 1972 RTX 440, 1974 Lazer 440Koler skiroule,1999 Skidoo 600 Then to a 2003 600 mxzx 144x2inch track Do some...