WASHINGTON, D.C. --- Michigan's two U.S. senators, Carl Levin and Debbie Stabenow, are trying to rework the current Senate fuel-efficiency plan to give automakers more time to make major changes. According to Associated Press reports, the Michigan senators' plan proposes that standards increase to 36 miles per gallon for passenger cars by 2022. Standards for pickup trucks, SUVs and vans would increase to 30 miles per gallon by 2025.