Mack Trucks has announced that it will be expanding its natural-gas-powered offerings in 2013 with natural-gas versions of the Mack Pinnacle and Mack Granite models. Both models will use the Cummins Westport ISX12 G engine. Mack already offers natural gas- powered Mack TerraPro Low Entry and Mack TerraPro Cabover refuse models. Like their TerraPro natural gas counterparts, the Mack natural gas-powered Pinnacle and Granite models will feature maintenance-free aftertreatment and require only a three-way catalyst to meet EPA and CARB emissions standards. Mack’s natural gas-powered trucks are available with CNG and LNG systems. Customer testing for the Pinnacle and Granite models is scheduled to begin this year.