The seventh annual State of Sustainable Fleets report arrived this week with a clear finding: fleets spreading their bets across multiple fuel types are proving more resilient than those waiting on a single clean technology.
Federal policy reversals reshaped the zero-emission truck market heading into 2026. The rollback of greenhouse gas vehicle standards, the expiration of commercial zero-emission vehicle tax credits worth up to $40,000 per medium- and heavy-duty unit, and the nullification of California's clean truck regulations left fleet managers uncertain about long-term procurement. More than $5 billion in state, local, and utility funding for clean projects continues to flow annually through 2028.
Natural gas is gaining share. The Cummins X15N 15-liter engine finished its first full commercial year with 71% of operating fleets reporting savings versus diesel. Battery-electric medium-duty vehicles also delivered lower operating costs than the vehicles they replaced, with class-wide registrations up 21% in 2025. Propane use grew as well, with more than 23,000 school buses now serving 1,100 districts in 49 states at prices 47% to 63% below gasoline.
Hydrogen remains a costly outlier at $18.86 per kilogram after incentives -- an 89% to 135% premium over diesel. Industry analysts say the fuel must reach $8 to $10 per kilogram to break even with diesel.
AI adoption among fleet managers reached 48%, with route planning, dispatching, and preventive maintenance diagnostics as the top use cases. Autonomous trucking pilots are advancing: Volvo's VNL Autonomous paired with the Aurora Driver is hauling freight for DHL and Uber Freight in Texas.
Source: FreightWaves -- https://www.freightwaves.com/news/state-of-sustainable-fleets-2026