Officials say the Obama administration is close to a deal with automakers to boost fuel economy.
Officials familiar with talks between the White House and automakers say recent changes to make it easier for light trucks to become more fuel efficient have lowered the proposal to 54.5 miles per gallon by 2025. Last month, the administration floated a 56.2 mile-per-gallon target.
Michigan lawmakers in a letter to the president last week called the higher proposal "overly aggressive." Automakers have said they'd work to get vehicles averaging 42.6 to 46.7 miles per gallon.
An administration official not authorized to speak about the negotiations said feedback from many manufacturers is positive and discussions are wrapping up.
In 2009, automakers agreed to raise fuel economy standards to 35.5 miles per gallon by 2016.