An Auto Media Group publication Sunday 8 November 2026
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Clean diesel dominating US truck market

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The inaugural North American Commercial Vehicle Show (NACV) in Atlanta, Georgia, saw truck and engine manufacturers presenting new and innovative clean diesel technologies.

A significant show of force for clean diesel was displayed by the more than 400 exhibitors on the floor, including new product announcements by Cummins, Volvo, Navistar, Daimler, and others according to the Diesel Technology Forum.

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Powering 33% of the USA heavy duty truck market and nearly 80% of the Medium Duty truck market, Cummins says it continues to innovate for the market. It says the X15 and X12 engines are engineered for optimal performance and power while offering class-leading fuel economy by using advanced air handling and fuel system controls.

Cummins says both engines utilise the single compact module after treatment, which provides longer maintenance intervals for the lowest cost of ownership. Cummins has unveiled details around the next heavy-duty 15-litre engine for 2022 for Class 8 line-haul trucks.

International Truck launched its new HV Series at NACV with the A26 12.4L big bore engine designed to deliver power and impressive reliability for a range of vocational applications.

Built from the MAN D26 engine crankcase, the International A26 engine produces up to 475 horsepower from a design that is much lighter than a traditional 15L big bore unit. It is the first engine to meet the B10 standard that requires 90% of delivered engines to travel 1,200,000 miles before a major repair.

The HV Series is also available with the Cummins B6.7 and Cummins L9 engines.
“Even as manufacturers explore new powertrains to meet the needs of their customers, there is no doubt that clean diesel will remain the prime mover for the trucking industry,” says Diesel Technology Forum executive director Allen Schaeffer.

“The new environmental performance achieving near-zero emissions further ensures that clean diesel is a solution for meeting current and future quality air and efficiency standards.”
“We see continuous improvement in efficiency and performance of clean diesel power,” says Schaeffer.

“Manufacturers are working toward meeting the challenge of the Phase 2 greenhouse gas emissions reduction and fuel economy rules by closer integration and optimization of engines and transmissions, along with improving emissions control system design and total vehicle integration. Additional gains in efficiency and further reductions in emissions will define the next generation of clean diesel power,” he says.
Announcements at NACV indicate that manufacturers see strong orders for the new generation of commercial trucks with the newest generation of clean diesel power through the end of 2017 and into 2018, as truckers look to upgrade their fleets and expand their service offerings.

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