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Does fuel economy get better with altitude?
Has anyone tried to test if you get better fuel economy at higher elevations? In theory it could have an effect since the air density decreases and you would have less drag. I know aircraft fly at higher altitudes to increase their range. It might be hard to see any difference in a vehicle since you have to control for road and traffic conditions. Plus rolling resistance is a lot of the problem at lower speeds and this doesn't apply to aircraft.
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