American automobiles must meet a federally mandated fuel-efficiency standard of 54.5 miles per gallon by 2025.

到2025年，美国汽车必须符合联邦法律规定的每加仑燃油行驶54.5英里的燃油经济性标准。

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So last year, we established a groundbreaking national fuel efficiency standard for cars and trucks.

WHITEHOUSE: America��s Energy Security

In fact, they will save money because a higher fuel efficiency standard obviously uses less fuel and ultimately costs less money to operate.

WHITEHOUSE: Press Briefing

Last year, after going about 30 years without raising fuel-efficiency standards, we finally put in place a national fuel-efficiency standard for cars and trucks.

WHITEHOUSE: President Obama on the Green Fleet Initiative