Sheela Tobben and Ryan Sachetta

Refinery outages have pushed spot gasoline on the U.S. Gulf Coast to a one-year high. The fuel’s premium to the corresponding Nymex futures jumped to 5.75 cents a gallon Wednesday as slowdowns cut availability of summer-grade gasoline, according to Robert Campbell, head of refined products research at Energy Aspects Ltd. "Recent weakness in summer-grade gasoline prices has also made refiners start shifting to producing winter-grade gasoline," he says.

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