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Set me straight, 85 vs 91 octane at high elevations

546 views 14 replies 11 participants last post by  bumpus  
#1 Ā·
Fueled up in Salmon Idaho and realized after the fact that I had filled with 85. Now, I have always been under the impression that higher octane at higher elevations is better and helps prevent engine knock. However, upon googling, it seems the opposite is true and 85 is recommended... Learn something new everyday I guess.