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True octane will not change the RPM's the engine governor or computer is set for. Also true higher octane fuel will only resist pre-ignition, or as we used to call it pinging. Since at higher altitudes there is less oxygen, the likelihood of pre-ignition is much less, hence a lower octane fuel run at higher altitudes will not damage anything. You don't need the higher octane at higher altitudes to resist pre-ignition since the possibility of pre-ignition is so low. Running a higher octane fuel in a lower compression engine will hurt nothing, will help nothing, only costs more. (I know some of the folks at the Paint Department in Chino, will have to ask them who thinks octane has a direct relationship to RPM's).
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