They appear ready to support the more aggressive timetable in exchange for the certainty of a single national fuel-economy standard, instead of a jumble of federal and state standards.

• 它们似乎准备支持政府提出的更加激进的时间表，以换取一个全美统一的燃油能耗标准，而不是诸多混杂的联邦和州标准。