I took a trip several years ago out west and went through NM. and AZ. I noticed the octane was lower than the 87 I purchase here at 600 ft. I know the air is thinner at altitude, but not up on the relationship to thin air and a drop in octane. I would think that you need more fuel to get a given bang out of an internal combustion engine with the air being less dense and hence lighter.
On the trip, I remember a mountain I went over, I think around Alamogordo, NM. that was 8500 ft as I recall...just a big blob of rock out in the middle of nowhere. I was running a 4.7L Dodge truck and I mean that thing turned to pure unadulterated puke crossing that thing. I guess the computer eventually would have figured things out, but the crossing didn't take but about 30 minutes and I guess it didn't have time to get it's thinking done. I was coming back east so the fuel I had was the lower octane I bought out west.
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