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On two separate morning visits to the scientists' lab, each man walked for an hour at an average speed that, in theory, should allow his body to rely mainly on fat for fuel.

在科学家的实验室里，每个人分别在上午的两次访问中，以平均速度走了一个小时，理论上，他的身体应该主要依靠脂肪作为燃料。

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Current corporate average fuel economy (CAFE) standards, introduced in 1985, require a fleet average of 27.5mpg from new cars.

现在公司的平均燃料经济性标准是1985年引入的，要求所有的新车的效率是27.5英里每加仑。

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One way to raise the average fuel economy is to increase the number of electric cars on the road.

VOA: special.2010.11.17

The fuel economy standard (FES) policy regulates the sales-weighted average fuel economy of new vehicles (designed to be similar to the Corporate Average Fuel Economy, or CAFE, standards, which were enacted in 1978 and have been recently tightened).

FORBES: A Gas Tax Is Much, Much, More Efficient Than The CAFE Standards So Why Have We The CAFE Standards?

Lawmakers on Capitol Hill are pushing a plan that would force automakers to produce more energy-efficient cars--increasing average fuel economy from an average 25 miles per gallon to 35 miles per gallon by 2020.

FORBES: Magazine Article

U.S. carmakers complain they now have to sell large numbers of money-losing smaller vehicles in order to sell high-profit larger vehicles and meet the overall fuel economy average.

FORBES: The Gas-Guzzler Relief Act