• The Vapor Rub: Summer versus Winter Gasoline Explained

    7 days ago - By Car and Driver

    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 the 1990 Clean Air Act, the Environmental Protection Agency began restricting the volatility of retail gasoline sold in the summer. Volatility is the point at which a liquid evaporates, or vaporizes, and while that's advantageous for a pot of...
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