If a bill that won the bipartisan support of a U.S. Senate committee on Tuesday becomes law, heavy truck manufacturers will have to meet fuel economy standards for the first time.
The bill calls for heavy truck manufacturers to improve fuel economy by 4 percent each year.
It also calls for raising the fuel economy standards for cars and light trucks from 25 miles per gallon to 35 miles per gallon.
However, the bill would allow federal officials to modify those standards if it proved economically unfeasible for auto and truck makers to meet them.
That loophole prompted Public Citizen President Joan Claybrook to label the legislation “a total joke.”