Quote:
Originally Posted by jonr
Thin air (hot, humid or altitude) will reduce engine maximum output and increase efficiency. It reduces pumping losses in the engine (but also reduces effective compression ratio) and it reduces wind resistance.
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No. You really need some data to back up that claim. Reducing the ambiant air pressure has exactly the same effect as closing off the throttle plate. There is no efficiency to be gained. But it does reduce aerodynamic air resistance for the vehicle body.