The Obama administration proposed on Wednesday doubling auto fuel efficiency to 54.5 miles per gallon by 2025, a White House energy priority that has come under scrutiny in Congress.
U.S. auto dealers are working to undo the Obama administration's fuel efficiency agenda, replacing car companies that for years kept such mandates at bay with the help of allies in Congress.
The Obama administration will push back the release of the most ambitious proposal ever for automakers to improve fuel efficiency of their passenger cars, sport utility vehicles and pickups.
