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This is mainly because the air/fuel mixture is not set for the higher altitudes. The lower atmospheric pressure at higher elevations means the engine will operate leaner then the ideal air/fuel mixture. If you set a vehicle to operate at only high altitudes then it would run to rich and have less power once you left the mountains. This overly lean condition is also why an engine will overheat more easily at high altitudes.

The thinner amount of oxygen of higher altitudes also has a very minor role in having less power.

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15y ago

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