US authorities have begun to take action to increase the fuel efficiency standards of cars in the country.

President Bush's administration has formally asked Congress to grant it authority to change fuel economy standards for passenger vehicles in the US.

The current standards have remained in place for 16 years, despite a rapid growth in fears over the US's fuel situation.

According to Reuters, the transportation secretary Norman Mineta has written to Congress leaders as well as leaders in the US's upper house, the Senate.

In his letter, Mr Mineta is reported as describing the need to increase efficiency standards as vital in order to lessen the country's reliance on imported oil.

In March, the Bush administration took measures to increase the fuel efficiency for the worst offenders by setting a new standard of 24.1 miles per gallon (mpg) for sport utility vehicles and pickups by 2011.

Cars currently have to meet an average of 27.5 mpg.

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