America’s Truck and Bus Fleets Continue Transition to Near-Zero Emission Engines

As America’s commercial truck and bus fleets progress towards near-zero emissions, advanced internal combustion engines remain predominant. Gasoline, diesel, natural gas, and propane remain the primary fuel sources. According to the Engine Technology Forum (ETF), the use of advanced near-zero emissions diesel engines increased by 4% in 2023 compared to 2022.

Based on S&P Global Mobility TIPNet data, the ETF’s analysis reveals that internal combustion engines power 99.9% of the nation’s commercial vehicles. Diesel dominates with a 76% share, followed by gasoline at 22%, with the remainder comprising natural gas and propane. Meanwhile, zero-emission technologies like battery electric and fuel cell vehicles constitute a small portion of the fleet. Transit buses lead with 7.8% electric vehicles (EV), while electric-powered commercial trucks and school buses account for 20,000 and 2,000 units, respectively.

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