Implementing federal regulations on fuel economy and emissions for commercial trucks has become a legal battle. Truck makers are split over whether one of the major OEMs should be granted the ability to pay penalties instead of complying with the US Environmental Protection Agency (EPA) standard. Navistar International Corp. paid a penalty to allow its non-conforming engines to go to market. Daimler Trucks North America, Mack Trucks, and Volvo Group North America used selective catalytic reduction technology and did meet the standard and dont want to see Navistar be excused
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