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I live at 10,200 ft altitude in Leadville, CO. I do know that an ICE produces less power the higher you go. I believe that I get good gas mileage, partly related to the altitude, but I rarely travel below 5280 ft, so I have little to compare to in my own vehicles.
My theory/guess is that for one thing you have considerably less air resistance up here, so that accounts for some. Another guess is that because there is less air, there will be lower readings in whatever sensors you have in your induction, that the ECU will call for less fuel to compensate.
So you have an already detuned engine, an ECU calling for a lean burn, and less air to push out of the way as you move forward.
Like I say, It's just a guess, but it sounds good to me.
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