Quote:
Originally Posted by BYprodriver
If fuel rated at 93 octane at sea level is used at high elevation (2,500 ft & higher) it may increase the octane rating, but it definitely will not lower the octane rating.
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It really should not do anything to octane rating. The only reason some engines are fine to run lower octane at higher altitude is due to reduced manifold pressure. A turbo charged engine that needs 93 octane at sea level would do well to have it in Denver as well. You could likely get away with running lower octane in a turbo car at altitude, but not without some performance degradation due to the timing being retarded.