July 25 (Reuters) - The U.S. Transportation Department said on Tuesday it may revise the 2021 model year fuel efficiency requirements as it reviews the Obama administration vehicle emissions rules a year earlier than previously disclosed.


In March, President Donald Trump ordered a review of U.S. vehicle fuel-efficiency standards from model year 2022 through 2025. U.S. regulators said in a notice published Tuesday they are preparing a new environmental impact statement and could adopt lower standards through 2025. (Reporting by David Shepardson; Editing by Jeffrey Benkoe)