New York CNN —Gas prices have spiked in and around Chicago after a tornado sidelined a major ExxonMobil oil refinery last week. A gallon of gas in Chicago is now selling for an average of $4.34, according to AAA. That’s 27 cents more expensive than just a week ago after a tornado narrowly missed the Joliet Refinery and knocked power out to the Channahon, Illinois, facility. Gas prices have also jumped in nearby Michigan, another battleground state in the upcoming presidential election. “It will increase supply and lower prices,” Lipow said.

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