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Higher temps decrease air density and creates less aerodynamic drag. This means you should get better MPGs at highway speeds. Air density is also decreased as you increase elevation.
I would think that increased humidity would increase density though, and increase aerodynamic drag.
Perhaps your fuel station has switched to a summer blend? This might be a better explanation for the increased fuel economy. Way too many variables involved to say conclusively what is responsible for your better MPGs.
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