The Phase 2 fuel efficiency and greenhouse gas emissions standards for heavy-duty vehicles and engines, proposed this summer, would provide substantial gains in fuel efficiency for heavy-duty vehicles by 2027. While ACEEE applauds the agencies’ excellent work in developing the Phase 2 standards, it asks them to strengthen the proposal in several areas to capture more of the available fuel savings. Greater reductions can be achieved, especially in the engines used for tractor trucks and vocational vehicles. It is essential that the program promote the development of the advanced technologies in all vehicles and engines and point the way to further, major gains for heavy-duty vehicles.
