Peterbilt supports Lower Greenhouse Gas emission initiatives, and has partnered with Westport Innovations and Cummins Engines to provide customers with alternative fuel power trains.

The Model 386 is available with Westport's GX LNG engine, while Models 320, 384, and 365 will soon be offered with factory installed Cummins ISL-G engines, using either LNG or CNG. Currently, Peterbilt has over 50 Model 320 CNG vocational trucks in operation in North America.

Peterbilt's LNG research initiative includes Model 386 program trucks built for evaluation by Wal-Mart under a funding program with Mojave Air Quality Management District. LNG Class 8 trucks allow trucking fleets to move to lower-cost, domestically available natural gas and/or biogas while offering industry-leading emissions, including lower greenhouse gas emissions, than current diesel engines.

The Westport LNG fuel system is comprised of LNG fuel tanks, proprietary Westport fuel injectors, cryogenic fuel pumps and associated electronic components to facilitate robust performance and reliable operation. The Westport LNG system is 2007 EPA and CARB certified to 0.8g/bhp-hr NOx and 0.01g/bhp-hr PM. This LNG version of the engine offers the same horsepower, torque, and efficiency as the base diesel engine.

The Westport ISX G engine is fueled with LNG, a safe, cost effective, low carbon, and low emissions fuel, and is available with 400 and 450 horsepower ratings and up to 1,750 lb-ft torque for heavy-duty port, freight and vocational applications. LNG fuel tanks can be configured to suit customer range requirements. LNG heavy-duty trucks are eligible for federal tax credits in the United States and may be eligible for other state-specific emissions credits.

With increased emissions regulations and increasing fuel prices, it is the right time to take advantage of the expansion in the LNG refueling infrastructure and pursue LNG technology applications. LNG is emerging as an alternative clean, high-performance fuel for trucks that is domestically available and economical. Peterbilt is committed to delivering products that reduce harmful emissions and realistically provide the performance and economics that our customers need.