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June 25, 2020   |   Diesel Technology Forum

Press Release

Diesel-Powered Trucks Vital to California and the U.S. Economy, Achieving Climate and Clean Air Goals

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“Meeting the climate and clean air challenges in the future will require many solutions, and we are confident that the newest generation of diesel technology is one of them.”


Even as the California Air Resources Board contemplates mandates for zero emissions vehicles, diesel technology in commercial vehicles will continue to play an important role in California and the nation’s economy for decades to come.



June 25, 2020 (WASHINGTON, DC) - The Diesel Technology Forum’s executive director Allen Schaeffer issued the following statement today on the occasion of the California Air Resources Board’s (CARB) consideration of the Advanced Clean Truck regulation:

Even as the California Air Resources Board contemplates mandates for zero emissions vehicles, diesel technology in commercial vehicles will continue to play an important role in California and the nation’s economy for decades to come.  

“Diesel is the technology of choice for America’s trucking industry because of its unique combination of features; the most energy efficient internal combustion engine, power density, driving range, reliability, durability and widely available fueling, servicing and parts networks. Continuous improvement that has now achieved near zero emissions, improving energy efficiency and capabilities of using low-carbon renewable biofuels, including renewable diesel and biodiesel, ensure diesel’s place in the future.

“Since 2010, a new generation of diesel technology has become the standard for heavy-duty trucks that delivers reductions of 98 percent of emissions of particulate matter and nitrogen oxide emissions. 

“According to the Diesel Technology Forum’s analysis of 2018-2019 U.S. vehicles in operation data (Class 3-8) provided by IHS Markit, 43 percent of the nearly 11 million diesel-powered commercial vehicles on U.S. roads – from box delivery trucks to 18-wheelers – are now powered by the newest generation of diesel technologies (MY 2010 and newer). Over just four years, the percentage of new-generation diesel trucks on America’s roads has nearly doubled, up from just 25.7 percent of the fleet in 2015. Even by 2040, IHS Markit projects that the newest-generation diesel technologies will retain the majority share of Class 8 vehicle sales.

“Beginning in 2011, all new heavy-duty trucks have been equipped with selective catalytic reduction (SCR) and particulate control technologies. These combine to achieve stringent new U.S. Environmental Protection Agency (EPA) and CARB emissions requirements for NOx emissions of no more than 0.20 grams per brake horsepower hour (g/BHP-hr). This is in addition to PM emissions levels of no more than 0.01 g/BHP-hr.

“In California only 36 percent of registered diesel trucks in operation are of this newest generation, placing the golden state 40th out of 50 for the penetration of new technology diesel engines on the road, falling short of the national average of 43 percent, and well behind Indiana where over 65 percent of all registered trucks are of the newest generation. 

“A combination of factors contributes to the lower penetration of new technology diesel engines, including economic conditions but also the regulatory environment where California’s truck and bus fleet rule has disrupted the marketplace, effectively delaying regular fleet turnover rates, keeping older, higher emitting trucks on the road for longer, and in turn delaying emissions reductions and cleaner air. 

“California’s consideration of an Advanced Clean Truck Rule is principally about meeting the state’s climate goals. Today, diesel engines using renewable diesel fuel and blends of biodiesel fuels in California are delivering more greenhouse gas benefits than all electric vehicles combined. The replacement of older trucks in California with more efficient new diesel models coupled with the use of these biofuels represents a low-cost solution to deliver substantial and immediate greenhouse gas reductions compared to other approaches.

Biodiesel and Renewable Diesel Infographic

“Among the West Coast states in Region 9 & 10, which includes California, Washington and Oregon, the use of newest-generation diesel trucks has delivered substantial emissions reductions and fuel savings. Between 2011 and 2018, the use of the newest, cleanest diesel Class 3-8 trucks has saved 12.3 million tonnes of carbon dioxide (CO2) and eliminated 1.8 million tonnes of nitrogen oxides (NOx). By 2030, the increased use of the cleanest diesel technologies is expected to deliver an additional 120.7 million tonnes of CO2 reductions and eliminate an additional 5.5 million tonnes of NOx collectively in these three West Coast states.

“Beyond this ACT rule, manufacturers are working with regulators at CARB and EPA on a Cleaner Trucks Initiative and rulemaking that will be finalized in the coming months and establish even further reductions in nitrogen oxide emissions making future diesel truck engines even nearer-to-zero emissions and contributing to achieve clean air goals. 

“Meeting the climate and clean air challenges in the future will require many solutions, and we are confident that the newest generation of diesel technology is one of them.”

Members of the Diesel Technology Forum are the leaders in advanced technology engines, vehicles, fuels, and equipment, both diesel and a range of alternative fuels, including electrification, hydrogen, natural gas, and others.

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About the Diesel Technology Forum
Celebrating its 20th anniversary in 2020, the Diesel Technology Forum is a not-for-profit organization dedicated to raising awareness about the importance of diesel engines, fuel, and technology. Forum members are leaders in advanced engines, vehicles and equipment, cleaner diesel and renewable biofuels and emissions-control systems. For more information visit https://www.dieselforum.org/.

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Key Contact

Media Inquiries:
Allen Schaeffer
Executive Director
aschaeffer@dieselforum.org
(301) 668-7230

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