I've noticed this. Starting mid-summer 2012, I figured my average mileage per season (last tank registered Feb 2015)...
Spring: 49.5 (7 tanks)
Summer: 51.2 (11 tanks)
Fall: 48.0 (9 tanks)
Winter: 39.9 (8 tanks)
My average commute is 3.7 miles. Winter is a double whammy: Your engine cools down quickly (can't plug in block heater at work or other places really) and your overall resistance is higher. Spring and Summer, I take a lot more long-distance trips, which usually contributes to higher MPG tanks in general.
Here in Idaho, winter is usually -10 to 40 degrees F (pending time of day and how much nature hates you), where summer is 70-100. Spring/Fall is usually 40-80.
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