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Paying at the Pump How Gasoline Works How Gas Prices Work Why is summer fuel more expensive than winter fuel?

Why is summer fuel more expensive than winter fuel?

In addition, many refineries in the United States are changing over to production of so-called summer fuels, an expensive process in itself, and refinery operators say they are also having to pass on some of the increased costs of producing gasoline with newly mandated levels of oxygenates, primarily ethanol.