Automakers will test the marketability of cars with three-cylinder engines in the U.S. Ford plans to offer a three-cylinder Focus or Fiesta by mid-2013 to be followed by a compact car from Mitsubishi. “This engine is a game-changer,” Steve Cropley of Autocar magazine, a British publication, said of the three-cylinder Ford Focus. Automakers are packing more power, measured by horsepower and torque, into these new engines.