I have detailed records from over four years of hypermiling. These are averages for my car and driving style and route, but can be extrapolated to others.
Temperature:
55 mpg at 20F, 80 mpg at 105F
Humidity (mornings only, counted as humid when there's dew or fog):
humid mornings 68 mpg, dry mornings 63 mpg
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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