At high altitudes, thinner atmospheric air containing lower oxygen density causes internal combustion engines to produce less power than at sea level.
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Answer
The statement is true. As altitude increases, atmospheric pressure drops and air becomes less dense, resulting in less oxygen available for fuel combustion and a corresponding loss in engine power.
The statement accurately describes the physiological and physical reality of mountain driving: elevated altitudes reduce air density, supplying less oxygen for engine combustion and causing reduced vehicle power on steep ascents.
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Key Concept
High Altitude Engine Performance Loss