News roundup: Baton Rouge has lowest average gas price in nation … Oil company to pay fines over three Atchafalaya oil spills … Analyst says Costco could hike its membership fees

    At the pump: Though the average price of a gallon of regular unleaded gas has shot up 8 cents over the past three weeks to $2.18, Baton Rouge reportedly has the lowest average price in the nation, at …

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