President Bush wants the authority to change automobile mileage rules.
With gasoline running around three dollars a gallon, Bush is hoping Congress will give his administration permission to raise mileage requirements for cars the way it did for pickups, vans and SUVs.
Tighter gas mileage rules were set for pickups, vans and SUVs last month.
The so-called "CAFE" standards set average fuel economy requirements for automakers.
Since 1990, the rules have said car companies must average 27 and a-half miles-per-gallon with their cars.
Aides say the president doesn't have a set plan for raising gas mileage requirements for cars.
US automakers would have 18 months to adjust to any new rules.