Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles (Phase 2).
Fuel efficiency standards for medium- and heavy-duty vehicles. There are four different categories: Combination Tractors, Trailers Pulled by Combination Tractors, Heavy-duty Pickup Trucks and Vans, Vocational Vehicles. The first phase is implemented for the period 2014-2018. The second phase is proposed (2021-2027)
Targets Phase 1 (based on (ICCT, 2015a), see references for more details)
- 5.7 for heavy-duty vehicles, 7.3 for medium-duty vehicles
Phase 2 (based on (ICCT, 2015b), see references for more details)
- 6.1 miles per gallon by 2027 for medium trucks
- 4.6 miles per gallon by 2027 for heavy trucks
Phase 3 of the program was approved in 2023, establishing new emissions standards for heavy-duty vehicles phasing in starting as early as model year 2027 and tightening up to MY 2033, as well as revising certain standards from Phase 2 of the program. In January 2025, legislation was introduced in Congress to disapprove the EPA's final rule on heavy-duty vehicles GHG emissions standards for this Phase. The rescission of the 2009 Endangerment Finding removed the EPA's authority to regulate GHG emissions under the Clean Air Act. In parallel, it has repealed all federal GHG standards for light-, medium-, and heavy-duty vehicles, including existing and future requirements.