Every September 15, as we resist switching to long sleeves and heated seats, fuel stations in all 48 continental states must begin dispensing winter-grade gasoline under strict federal deadlines. But topping off in Chicago isn’t the same tankful as in Boise. Enter the confusingly zoned world of winter and summer gasoline. Starting in 1989 before […]
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The Vapor Rub: Summer versus Winter Gasoline Explained
