“The State of Sustainable Fleets 2026 Market Brief,” released May 4 during the 2026 ACT Expo in Las Vegas, paints a detailed picture of a commercial transportation industry navigating one of the most challenging and rapidly evolving periods in recent history. Now in its seventh year, the annual report provides a technology-neutral analysis of how fleets are adapting to economic volatility, shifting regulations, supply chain pressures, and changing energy markets through increasingly diversified transportation strategies.
Presented at ACT Expo—North America’s largest advanced transportation technology conference—the report was developed by TRC Companies, a WSP member company specializing in engineering, infrastructure, and energy consulting. The findings highlight how fleets are responding to mounting operational pressures that include a prolonged freight recession, rising equipment costs linked to tariffs, and uncertainty surrounding federal transportation and emissions policy. According to the report, tariff-related increases alone may add as much as $35,000 to the cost of a new commercial truck.
The policy landscape has also shifted significantly over the past year. Changes at the federal level—including the rollback of greenhouse-gas vehicle standards, the elimination of federal incentives for zero-emission trucks, reductions in clean transportation funding programs, and the reversal of California clean-truck mandates—have accelerated a transition away from a centralized national strategy toward a more fragmented mix of state-led initiatives and market-driven decision-making.
Despite those disruptions, the report concludes that the sustainable transportation market continues to mature rather than contract. Analysts estimate that more than $5 billion in annual funding from state governments, utilities, and regional programs remains available through at least 2028 to support fleet modernization and alternative fuel adoption. The report also notes that artificial intelligence is becoming increasingly integrated into mainstream fleet operations, supporting everything from predictive maintenance and routing optimization to fuel management and operational efficiency.
One of the strongest themes throughout the 2026 report is the growing importance of diversification. Rather than relying exclusively on a single fuel or powertrain technology, fleets utilizing a portfolio approach—including advanced diesel, biodiesel, renewable diesel, natural gas, propane, battery-electric, and hydrogen solutions—are demonstrating greater operational resilience and improved ability to manage total cost of ownership amid market instability. The report frames diversification not simply as a sustainability strategy, but increasingly as a business continuity and risk-management tool.
Within the diesel sector, the report highlights continued improvements in efficiency and the rapidly expanding role of renewable fuels. According to S&P Global Mobility data cited in the report, new Class 8 truck registrations fell 16 percent in 2025 due largely to economic headwinds and equipment cost increases. At the same time, fleets have intensified efforts to improve fuel economy through vehicle technologies, driver training, aerodynamics, idle reduction systems, and other efficiency measures. Some leading logistics fleets are now exceeding 8.5 miles per gallon in real-world operations, while top-performing fleets have reported achieving 11.5 mpg or greater under optimized conditions.
The report also underscores the accelerating adoption of biodiesel and renewable diesel as immediate, lower-carbon solutions that can be utilized in existing diesel engines and fueling infrastructure. In California, renewable diesel and biodiesel together displaced 74 percent of petroleum diesel used in transportation during 2024, with similar trends continuing into 2025. More than half of surveyed fleets now report using one or both fuels, while interest in higher biodiesel blends—including B99 and B100 applications—continues to expand as fleets pursue strategies to reduce emissions without replacing vehicles or infrastructure.
Meanwhile, federal emissions regulations for advanced diesel engines continue progressing. The EPA’s upcoming 2027 heavy-duty NOx and particulate matter standards remain on schedule, with the report estimating compliance costs could increase vehicle prices by approximately $8,000 to $18,000 per truck. Even so, the report notes that manufacturers continue investing heavily in advanced diesel technologies capable of delivering near-zero emissions performance alongside improved fuel efficiency.
The 2026 market brief was supported by title sponsors Penske Transportation Solutions and Volvo Trucks North America, with additional support from Exelon Companies and S&P Global Mobility, whose market data and industry expertise contributed to the report’s analysis of evolving transportation trends.”
Adapted from an article originally shared by Biobased Diesel Daily. Image Credit: Flickr – United Soybean Board.