I have noticed this for years every winter. You are correct about the additives, reformulated gas is sold in the winter with a higher alcohol content to eliminate fuel line freeze up. Some areas of the country use reformulated fuel year round to get out off emmision testing so the mileage in these areas would not change in the winter. The alcohol is cleaner burning but does affect mileage. I have read articles in magazines that this is why some states/counties have gone to emmision testing, because it is cheaper to pay for the testing once every year or two than to run the reformulated gas year round.
H2 novice
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