Kenworth to Introduce Cummins' New Gasoline Engine in Medium-Duty Trucks

Kenworth introduced the Cummins B6.7 Octane engine at NTEA Work Truck Week 2025 for its Class 5-7 conventional trucks. Meeting EPA 2027 and CARB low NOx standards.

Kirkland, United State- Kenworth trucks Co., an American truck manufacturer, showcased the new Cummins B6.7 Octane engine at NTEA Work Truck Week 2025. This gasoline engine, designed for Kenworth’s Class 5-7 conventional trucks, will meet EPA 2027 certification and CARB low NOx standards.

The B6.7 Octane delivers 200-300 hp and up to 660 lb.-ft. of torque, paired with the PACCAR TX-8 automated transmission. Cummins claims the engine offers 10% better fuel efficiency than similar gasoline engines and supports extended oil drain intervals of up to 15,000 miles.

Mr. Kevin Haygood, Kenworth assistant general manager for sales and marketing, said, “The engine was validated against the same standards as Cummins diesel B6.7 engine. With environmental regulations changing, it spurred us to offer another engine option to our customers. The new Cummins B6.7 Octane engine will meet stringent emission regulations, so we expect it to be a popular option in California and other states that have adopted CARB’s standards. It can be a great fit for many of our customers’ applications, especially in P&D, and towing applications. We also see it being popular for the lease and rental markets, as well as for landscapers, where those behind the wheel are used to driving gas-powered vehicles.”

According to Haygood, the Cummins B6.7 Octane engine simplifies maintenance by eliminating the need for DEF and active regens, using a 3-way catalyst for emission control. With flexible fuel tank options (45-80 gallons), body builders can streamline upfits.

Haygood added that the engine could attract new markets, especially fleets operating Class 5-6 gasoline trucks, enabling them to adopt Kenworth vehicles while maintaining simplified operations.