Natural Gas Powered Vehicles by Peterbilt

Peterbilt Announces Availability of Natural Gas Powered Vocational and
Aerodynamic Vehicles

VANCOUVER, BC and DENTON, TX, Aug. 31 /PRNewswire-FirstCall/ - Peterbilt
Motors Company announced that the company is taking immediate orders for the
production of its vocational and aerodynamic vehicles powered by compressed
and liquefied natural gas (NG). The Model 365 and Model 384 will be offered
with the Cummins Westport ISL G and built at Peterbilt's truck manufacturing
facility in Denton, Texas.
"Our Models 365 and 384 are examples of Peterbilt's commitment to delivering
products that will reduce harmful emissions and provide the performance and
overall value our customers need," said Bill Jackson, Peterbilt General
Manager and PACCAR Vice President. "These two NG powered platforms join
Peterbilt's three medium duty hybrid electric vehicles currently in production
to offer the widest range of environmental friendly options to our customers."
The Peterbilt Model 365 NG features innovative solutions to improve ride and
handling, enhance weight distribution as well as maximize performance and
profitability without sacrificing overall efficiency. The Model 365 NG is
equipped with the powerful ISL G providing a 320 horsepower rating and 1,000
lb-ft of torque. The Model 365 has a 115" BBC, and is available in both
set-forward and set-back axle configurations and sets the standard for
quality, durability, productivity and environmental responsibility.
The Cummins Westport's ISL G powered Model 384 provides the industry's
cleanest burning aerodynamic platform with the power and performance to meet
the needs of a wide variety of customer applications including line, bulk and
tanker hauling. Additionally, the Peterbilt Model 384 has been recognized as
fuel efficient and environmentally-friendly by the EPA's SmartWay program.
Peterbilt is dedicated to providing its customers the latest advances in
aerodynamic design and engineering combined with the latest alternative fuel
technologies.

About Cummins Westport ISL G Natural Gas Engine for Heavy Duty Trucks

Cummins Westport's ISL G natural gas engine for heavy-duty Class 8 trucks
allows 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 comparable diesel engines. Based on the Cummins
ISL diesel engine with cooled EGR, the NG version integrates robust diesel
components into an engine specifically designed for alternative fuels and
offers similar horsepower, torque, and efficiency as the base diesel engine it
is replacing. The engine is certified to the toughest global emissions
standards and meets U.S. EPA and CARB 2010 emissions standards today.
The Cummins Westport ISL G engine can be fuelled by either compressed natural
gas (CNG) or liquefied natural gas (LNG)- both are cost effective, low carbon,
and low emissions fuel-and is available with a 320 horsepower rating and a
1,000 lb-ft torque rating for heavy-duty port, freight and vocational
applications. CNG or LNG fuel tanks can be configured to suit customer
applications and range requirements. NG heavy-duty trucks are eligible for
federal tax credits in the United States and may be eligible for other
state-specific emissions credits. For more information about Cummins Westport
and the ISL G visit www.cumminswestport.com

About Peterbilt Motors Company

Based in Denton, Texas, Peterbilt Motors Company combines a global reputation
for industry leading design, innovative engineering and fuel efficiency
solutions, with superior quality to engineer a truck that stands as the
"Class" of the industry. Through its 247-plus North American dealer locations,
Peterbilt also provides a comprehensive array of TruckCare(R) programs to
support its full lineup of vehicles, including hybrids, with aftermarket
support programs. Customers enjoy industry leading service and support,
including preventive maintenance plans, expedited QuickCare services,
automated parts inventory replenishment and 24/7 complimentary Customer
Assistance through 1-800-4-Peterbilt. For more information about Peterbilt,
visit www.peterbilt.com.

Note: This document contains forward-looking statements about Cummins
Westport's business, operations, technology development or to the environment
in which it operates, which are based on Cummins Westport's estimates,
forecasts and projections. These statements are not guarantees of future
performance and involve risks and uncertainties that are difficult to predict,
or are beyond Cummins Westport's control. Consequently, readers should not
place any undue reliance on such forward-looking statements. In addition,
these forward-looking statements relate to the date on which they are made.
Cummins Westport disclaims any intention or obligation to update or revise any
forward-looking statements, whether as a result of new information, future
events or otherwise.

SOURCE Cummins Westport Inc.

Inquiries: Cummins Westport Inc./Westport Innovations Inc., Darren Seed,
Director, Investor Relations, Phone: (604) 718-2046, Email:
invest@westport.com, Web: www.westport.com; Cummins Inc., Mark Land, Public
Relations Director, Phone: (317) 610-2456, Email: mark.d.land@Cummins.com,
Web: www.cummins.com