Research reveals more emissions benefits at lower cost through

Washington, DC, July 21 2022 (GLOBE NEWSWIRE) — A new study that evaluates several approaches to reducing greenhouse gas (GHG) and other emissions from medium and heavy-duty vehicles from 2022 to 2032 finds significant benefits with advanced diesel technology, particularly when using renewable biofuels, versus an electrification strategy.

Medium and heavy trucks operating in 10 northeastern states (Connecticut, Delaware, Massachusetts, Maryland, Maine, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont) that have adopted low-emission vehicles (LEVs) and zero-emissions vehicles of California (ZEV) were studied by Stillwater Associates for the Diesel Technology Forum. An analysis was undertaken to analyze the environmental benefits that can be obtained from three strategies over the period 2022-2032; electrification, accelerated fleet rotation and use of biodiesel and renewable diesel fuel.

“As we research the best ways to reduce greenhouse gases and other emissions, this study demonstrates that accelerating fleet turnover and using renewable fuels and biodiesel can deliver far greater benefits. (3X) that outweigh those possible for electric vehicles in the study region.Advanced diesel technology is more efficient, more affordable and above all more available than others.

“The urgency of implementing solutions to reduce greenhouse gases from transport and fight against climate change is heard on a daily basis. Transitions to new energy sources still involve considerable uncertainties and longer time frames – a decade or more – for meaningful implementation. Some solutions will be available sooner than others and on a larger scale than others. Advanced diesel technology, along with renewable and biodiesel fuels, are key solutions available that can have a big impact today,” said Allen Schaeffer, executive director of the Diesel Technology Forum.

The significant benefits of using low-carbon, renewable bio-based diesel fuels emerge more clearly from this analysis. As these fuels can be used in all diesel vehicles today, powering the diesel vehicles in the study with 100% renewable diesel resulted in three times greater cumulative GHG reductions by 2032 than the electric vehicle scenarios . Using B20 – a blend of 20% biodiesel and 80% petroleum diesel – provided about the same cumulative GHG reduction.

“All eyes seem to be on electrification as the best if not the only strategy for the future of fuel and technology in the transportation sector. This work has illuminated it’s too simplistic; that there are strategies lower cost, more available emissions reductions for these performance vehicles that can deliver deeper emissions reductions faster,” said Gary Yowell, automotive engineer at Stillwater Associates.

Beyond GHG emissions, the research also highlighted the impacts of an advanced diesel strategy versus electrification on regional air quality, concluding that the business as usual scenario replacing diesel vehicles by model year prior to 2007 that lacked diesel particulate filters by advanced technology diesel vehicles provided the greatest reduction in particulate matter (PM). This is due to the 98% PM reductions of new technology diesel engines compared to the 95% PM reduction of EVs assuming power comes from the US utility grid.

When it comes to nitrogen oxide (NOx) emissions, EVs have 98.5% less NOX than pre-2007 diesel vehicles on a per kilometer basis, and MY 2010 and later vehicles have 79% less NOx emissions than a 2007 diesel model. However, when replacing a medium and heavy diesel vehicle with an electric vehicle and rated on an annual mileage basis, the NOx benefit is diminished. Electric vehicles are typically deployed on shorter journeys and have a shorter range than a comparable diesel vehicle, with around 87% of daily mileage. Given this difference in mileage, the NOx emission reductions for a fleet switching to EVs will be less than the typical turnover from older generation diesel to advanced technology with Selective Catalytic Reduction (SCR) systems which reduce NOx by 98%.

Based on cumulative fleet conversion costs, converting a medium and heavy fleet of 10,000 vehicles in the region to electric vehicles costs more than three times as much as the equivalent cost of new technology diesel vehicles. The additional EV cost for Class 7/8 vehicles is $250,000 for the vehicle and $45,000 for the charging infrastructure.

View and download the full study at

View and download the infographic at

A virtual live event will take place with the researcher at 1:00 a.m. ET this afternoon. Register now via and-biodiesel-fuels


About the Diesel Technology Forum

The Diesel Technology Forum is a non-profit organization dedicated to raising awareness of the current and future role of diesel engines, equipment and fuels. Forum members are leaders in advanced diesel technology, emissions controls, and petroleum-based and renewable biofuels. For more information, visit

Connect with us

For the latest insights and insights from leaders in clean diesel technology, join us on Facebook, follow us on Twitter @DieselTechForum or YouTube @DieselTechForum and connect with us on LinkedIn. Get it all by subscribing to our Diesel Direct newsletter for a weekly roundup of clean diesel news, policy analysis and more straight to your inbox.