In 2008 Congress mandated higher CAFE standards, 35 mpg by 2020. Detroit automakers, under assault from import competitors and slower economic growth, cried foul. They claimed billions of dollars would be needed to retool plants to meet the standard. Congress provided $25 billion in low-cost loans to help the automakers. Now, domestic automakers are seeking an additional $25 billion. Time is running out. While foreign automakers are eligible for the loans, they are not expected to participate.