Mercedes Drivers Stung by Shale Boom’s Quirks at the Pump

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The shale oil boom is proving far less kind to Mercedes-Benz drivers than it is to those sitting behind the wheel of a Toyota Camry or Chevrolet Impala.

While regular gasoline-chugging drivers are paying just $3.03 a gallon in the U.S., the lowest in four years, those cruising around in luxury cars and demanding only the finest of grades, known as premium, have seen smaller declines. The price gap between the two grades swelled last week to the widest since 2008.