Quote:
Originally Posted by basjoos
You get better mileage at higher elevations because the air is thinner, which reduces your aerodynamic drag. Also the thinner air reduces the power output of normally aspirated engines and you have to operate at higher throttle settings with reduced pumping losses to get the same power output.
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Bingo. Hot air = higher density altitude. So due to the heat your low altitude was actually providing the FE benefits of higher altitude.