To fight air pollution, Congress boosted the average fuel economy standard for passenger cars from 18 mpg to 27.5 mpg between 1978 and 1985.

为了对抗空气污染，从1978到1985年间，美国国会把客车平均耗油量标准从每加仑行驶的公里数18提高到27.5。

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Bush wants to reduce U.S. gasoline usage by 20% by 2012 through a massive increase in the renewable fuels standard and a hike in the corporate average fuel economy standard for cars and light trucks.

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Then, by 2025, the corporate average fuel economy (CAFE) standard rises to 54.5 mpg, a level of fuel efficiency that has virtually ever carmaker stretching to come up with new technologies.

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That regulation nearly doubles the mileage requirement for manufacturers, making them boost their corporate average fuel economy (CAFE) from the current standard of 29.7 mpg for cars and light trucks to 54.5 mpg.

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