“What type of powertrain is best for my fleet, and when should I implement it?” This is a crucial question for fleet managers today. With relaxed regulations in California, decisions regarding equipment are shifting back to what is financially practical for fleets. At the recent ACT Expo, Greg Treinen, Vice President of On-Highway Product Development at Daimler Truck North America, shared insights on how fleets can navigate this decision-making process—not with a binary approach, but with a flexible, application-focused strategy.
“We aim to keep pace with current developments,” Treinen noted. “A key element of this discussion is the strides we’ve made in advanced clean diesel technology.”
Evolution of Diesel Technology
Amid increasing discussions around zero-emission vehicles, diesel remains a viable option. The fifth-generation Freightliner Cascadia showcased at ACT Expo is a testament to the advancements in clean diesel technology.
This upgraded Cascadia features improved aerodynamics, leading to better fuel efficiency and reduced emissions. “We’ve optimized the design to channel air around the vehicle more effectively,” Treinen explained. “This model achieves nearly a 2% increase in fuel efficiency.”
In addition to these updates, traditional methods like downspeeding continue to prove beneficial. Treinen highlighted the value of operating with lower rear axle ratios to decrease engine RPM and fuel consumption without sacrificing performance. This serves as a reminder that even current truck powertrains have room for advancements in cost and emissions reduction.
The Rise of Natural Gas
Natural gas, particularly renewable natural gas (RNG), is gaining traction due to advancements such as the Cummins X15N, specifically designed for over-the-road and regional hauling.
“We now have a Cummins product tailored for these applications, featuring optimal power ratings and enhanced fuel efficiency,” Treinen stated.
For fleets that already have natural gas infrastructure or operate in areas with stable RNG supplies, the financial advantages are significant. Favorable fuel prices and predictable total cost of ownership (TCO) calculations facilitate investment justifications. “Renewable natural gas is an appealing option for many fleets, offering opportunities for carbon reduction and cost savings,” Treinen noted.
Battery Electric Trucks: Not a Uniform Solution
Battery electric vehicles (BEVs), like the eCascadia, are now a reality. Daimler has accumulated over 20 million miles in customer driving experience, with several fleets successfully using them in dedicated applications.
“The eCascadia continues to be released,” Treinen confirmed, adding, “We offer a product that meets customer requirements, provided they have the necessary infrastructure and charging capabilities.”
However, alignment is crucial. Treinen urged caution in setting expectations: “I don’t expect immediate results from electric trucks.” BEVs demand extensive planning—not only for charging infrastructure but also for route optimization and power grid coordination. Nonetheless, they can be highly effective for the appropriate fleet scenarios, contributing to decarbonization.
Diverse Powertrains for One Fleet
The ACT Expo highlighted that there isn’t a one-size-fits-all solution. Instead, a diverse approach is necessary—diesel for long-haul, natural gas for regional routes, and electric for urban and return-to-base services. Fleets require guidance to find the best combination.
“We strive to provide our customers with the most suitable propulsion systems to meet their needs,” Treinen stated.
What offers reassurance to fleet managers is Treinen’s open acknowledgment of the market’s current uncertainties. Fuel choices, infrastructure timelines, and regulations are all in flux, but that doesn’t warrant delay.
“These are not short-term decisions,” Treinen said. “We already have products available for fleet implementation.”
The message is clear: Don’t postpone decisions. Focus on aligning the truck powertrain with specific applications. Identify where stable fuel prices, predictable routes, and available infrastructure enable confident progress—whether that involves optimizing diesel specifications, investing in natural gas, or initiating a BEV pilot program.
Watch the video for more of Treinen’s insights.
