Quote:
Originally Posted by THE SCUD
Actually, you're got that wrong. High altitude means you can use a lower octane. All an octane rating means to us, in reality, is that the gas is less sensitive to pre-detention. At a higher elevation, you have less oxygen, thus a lower chance of pre-det - therefore higher octane is less important the higher you go. This is why some places in high-alt Colorado sell 85 and 83 grade.
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Good to know. As far as I always knew, you get worse performance from an engine the higher up you go. Not necessarily octane related of course.