The effects that a stricter vehicle fuel economy standard may have on consumer choice are difficult to predict, panelists at a Resources for the Future event said Nov. 3.rnPanelists also said Corporate Average Fuel Economy (CAFE) standard must be combined with carbon pricing to help drive technological innovation and that the standard may be less effective at reducing fuel use, and thus greenhouse gas emissions, than raising gasoline taxes. In April, the Environmental Protection Agency and the National Highway Traffic Safety Administration released a final rule for cars and light trucks requiring a 40 percent increase in fuel economy to a combined 35.5 miles per gallon by model year 2016. The fuel standard will be phased in beginning in 2012. The rule also will limit vehicles' greenhouse gas emissions in 2016 to an average of 250 grams of carbon dioxide per mile (41 ER 723, 4/2/10).
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机译：11月3日，“面向未来的资源”活动的小组成员说，更严格的车辆燃油经济性标准可能对消费者的选择产生的影响难以预测。小组成员还表示，企业平均燃油经济性（CAFE）标准必须与碳定价结合起来，有助于推动技术创新，并且该标准在减少燃料使用量（从而减少温室气体排放）方面不如提高汽油税有效。 4月，环境保护局和美国国家公路交通安全管理局发布了最终法规，要求轿车和轻型卡车的燃油经济性提高40％，到2016年前合每加仑35.5英里。燃油标准将分阶段实施。从2012年开始。该规则还将2016年车辆的温室气体排放量限制为每英里平均250克二氧化碳（41 ER 723，4 / 2/10）。
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