This will help the little guy that Trump seemed so concerned about in his campaign, by causing them to spend more on fuel for a car:

EPA Set to Roll Back Fuel Economy and Auto Emissions Standards (Marketwatch)

The Trump administration is preparing to roll back emissions and fuel-economy standards on automobiles, the New York Times reported late Thursday. The Times said Environmental Protection Agency chief Scott Pruitt had submitted a proposal of the plan to cut regulations to the White House, and it is expected to be announced in the coming days. Weakening clean-air and efficiency rules would be a major victory for the auto industry and would undermine one of former President Barack Obama’s signature policy achievements. Any rollback is likely to face legal challenges, particularly from California and 12 other states that have set their own stricter standards.