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In response to the growing need for low-emission alternative fuel vehicles, Mack Trucks announced today the availability of natural gas-powered engines for refuse applications. The Mack TerraPro Low Entry model is now available for order with heavy-duty natural gas engines supplied by Cummins Westport. The TerraPro Cabover model will be available later. The 9-liter Cummins Westport ISL G is rated at 320 hp, can use compressed (CNG) or liquefied natural gas (LNG), and has a three-way catalytic converter to meet EPA 10 emissions standards. Natural gas burns very cleanly, there is an abundant supply here in North America, and it’s comparable to diesel in terms of cost over the life of the vehicle.