The U.S. Transportation Department said on Tuesday it may revise auto fuel efficiency requirements starting with the 2021 model year, a year earlier than previously disclosed, and could adopt lower standards through 2025. The US Transportation Department may freeze fuel efficiency standards for cars from model year 2021 to 2025 , a year earlier than previously disclosed , it said . The revised environmental efficiency standards would overturn the Obama administration 's plan to raise the standards each year from model years 2022 to 2025 . President Trump launched a review of those rules after auto ##makers said the Obama administration did not adequately determine their compliance . However , the Alliance of Automobile Manufacturers said that the review of environmental standards goes ahead regardless of any relaxation to US regulations .
The US Transportation Department may freeze fuel efficiency standards for cars from model year 2021 to 2025 , a year earlier than previously disclosed , it said . The revised environmental efficiency standards would overturn the Obama administration 's plan to raise the standards each year from model years 2022 to 2025 . President Trump launched a review of those rules after auto ##makers said the Obama administration did not adequately determine their compliance . However , the Alliance of Automobile Manufacturers said that the review of environmental standards goes ahead regardless of any relaxation to US regulations .