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Originally Posted by ldgregory
Altitude definitely does play a factor in dropping down to a lower octane rating. From reading (a few years ago), oftentimes, a 2,000 increase in elevation was enough to drop an octane rating with no appreciable loss in power or premature detonation due to the lower cylinder pressure.
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I agree in principle that altitude does reduce the need for a higher AKI fuel. I just think that fuel variation is greater than altitude impact.
If in fact you have sufficient altitude to reduce pre-ignition significantly, you likely have sufficient power degradation from the altitude to notice that impact as well, IMO. The appreciable loss in power is significant, but is due to the altitude more than the fuel in that case. If you always drive at that altitude, it likely isn't apparent.
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