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The ratio is the same, the amount of air available to squish is less.
At 5000' you don't need more than 90. I'm using 87 @ 850' and it doesn't make a nickel's worth of difference in economy, highway, city or combined, vs. 93.
Here's something to think about: If higher octane is used for high compression engines in order to reduce detonation by inhibiting flame propagation why not put your gas in an open bucket or drum for a few days before pouring it into your tank? The 'fast stuff' will have evaporated early on, leaving the 'slow stuff' behind, effectively raising the octane rating for free!
Move over, Einstein! I's a geenious too!
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Last edited by Beav; 07-07-2006 at 09:35 PM.
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