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Standards for medium- and heavy-duty vehicles would improve fuel efficiency and cut carbon pollution to reduce impacts of climate change, while bolstering energy security and spurring manufacturing innovation. The proposed standards are expected to lower CO2 emissions by approximately 1 billion metric tons, cut fuel costs by about $170 billion, and reduce oil consumption by up to 1.8 billion barrels over the lifetime of vehicles sold under the program. These reductions are nearly equal to the greenhouse gas emissions associated with energy use by all U.S. residences in one year.

Notice of Proposed Rulemaking

NEPA Process


U.S. Department of Transportation National Highway Traffic Safety Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
1-888-327-4236
1-800-424-9153 (TTY)