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Think of it this way, at 10,000 feet, your hemi only puts down 65-70% of rated HP (thats' off the top of my head). So essentially, you're taking it "easier" on the gas.
In theory, your hemi is capable of the exact same mileage at sea level as it is at 10,000ft elevation, but you'd need to reduce your "foot"...
Pilots of non-turbo aircraft have to be aware and "compensate" for the fact that our airplanes have different fuel usage (less fuel at throttle setting) and have radically different takeoff performance since motors are making a fraction of full power. I've got a table somewhere that tells me altitude, % of power output, and how much longer take-off will take a altitude. Same thing happens in naturally aspirated trucks.
Yes, turbos compensate for altitude. An ecoboost should kill a hemi on a dyno at 10,000 feet.
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