Heavy truck manufacturer Peterbilt Motors Co. has rolled out three natural gas-fueled models equipped with the Cummins Westport ISL-G engine, which offers a 320 hp rating and 1,000 ft-lbs. of torque. The vehicles run on either compressed or liquefied natural gas. “Our natural gas Models 384, 365 and 320 demonstrate our industry leadership in developing products that will reduce harmful emissions and provide exceptional fuel efficiency,” said Bill Jackson, Peterbilt general manager.

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