Navistar Inc. and Clean Air Power Ltd. have entered into a concept development agreement to enable Navistar’s MaxxForce 13 big-bore engine to run on natural gas and diesel fuel for the North American market. Clean Air Power’s Dual-Fuel combustion technology will be used to deliver an advanced EGR (exhaust gas recirculation) engine that is fully compliant with U.S. EPA 2010 on-highway diesel emissions. Upon successful concept development, the two companies will move forward to product development and validation. Clean Air Power says it will spend about $1.5 million on developing the concept over the next 10 months and that the companies will seek U.S. grant funding for full production during that time. MaxxForce 13 natural-gas engines with Dual-Fuel technology initially will be targeted for the regional haul tractor market; the companies’ goal is to achieve a 400-mi (645-km) range. Navistar notes that the flex-fuel technology, once in production, could be used in global markets and in other products as well.