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Originally Posted by plusaf
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but, again, an electric supercharger that would pump the intake flow "all the way up to" sea-level pressure certainly couldn't hurt the engine, though it obviously would affect gas mileage.... if you're at high altitude, and there's less air per intake stroke, and the fuel/sir ratio stays within narrow bounds, adding more air would result in more fuel. performance might go up, but mpgs would almost of necessity and physics, drop.
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Back in 1972, I drove another 1500 cc vehicle, a VW MicroBus across the high plains of Wyoming, Colorado, Utah and via Reno to San Francisco. Drafting semi-trailer trucks was not an option, it was manditory to keep at highway speeds.
As for MPG, the impact would be modest and still better than sea level performance. The Prius simulator shows high altitudes give great MPG primarily due to low air drag. Unfortunately, I don't think the simulators report "time to reach passing speed" and maximum speed up an "x% grade" or against a "y miles per hour head wind." But then I haven't made a through study of the Prius simulators.
Bob Wilson