My historical data shows a 12% reduction in FE when it's wet. I record it as "wet" when I would rather not be out in that weather, or would choose to take an umbrella, or right after a rain when water is standing on the roads. If it's just misting but the roads are dry, I count that as dry.
My data also shows an 8% gain when it's humid. Comparing only morning commutes, and calling it "humid" when there is dew on the car or fog in the air.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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