The effort to improve fuel economy does not apply to chassis that carry RVs or vehicles that tow RVs.
The exceptions have the industry breathing a sigh of relief, according to The Truth in Elkhart.
Had RVs been included in the bill, prices of the vehicles would have gone up and engine power of trucks that tow the vehicles would have gone down, the newspaper reported.
Passenger cars and other vehicles sold in the U.S. must reach an average of 35 mile per gallon by 2020. The current average is 25 mpg.