A rise in the fuel economy standard to 35mpg for cars and trucks by 2020 (40% higher than current levels) has today been approved by the U.S. House of Representatives as part of a wide-ranging energy bill.

Some believe the higher CAFE standards will add several thousand dollars to the price of every vehicle, including ranking Republican on the House Energy and Commerce Committee Rep. Joe Barton of Texas.

There’s some doubt as to whether the legislation will be passed as Democratic leaders still require 60 votes, which they may find hard to gain, reports Automotive News.

The U.S. Senate approved the same 35mpg by 2020 bill back in June.