The Trump administration is moving to overturn Biden-era fuel economy regulations, with Transportation Secretary Sean Duffy announcing Friday that the rules were unlawful and initiating a rollback. The change could reduce regulatory burdens for automakers and potentially stall the nation’s shift toward electric vehicles (EVs).
The Transportation Department’s newly issued rule claims the previous administration violated federal law by incorporating EVs into the formula for national fuel economy standards. Although the rule does not immediately alter current regulations, it authorizes the National Highway Traffic Safety Administration (NHTSA) to make adjustments in the months ahead.
Lawmakers and industry groups respond
In parallel, Republican lawmakers added provisions to the pending Senate budget bill that would eliminate penalties for automakers that fail to meet fuel economy standards with gasoline-powered vehicles. Together, these moves signal a broader effort by the Trump administration to reverse course on electric vehicle support.
However, under the Biden administration, automakers faced a requirement to achieve an average of 50 miles per gallon by 2031, up from the current 39 mpg for light-duty vehicles. The rules, finalized in 2024, mandated annual increases of 2% in fuel efficiency for passenger cars beginning in 2027, and for light trucks starting in 2029. The standards were partially based on projected growth in EV sales.
Industry groups argue that the Biden-era targets were unrealistic and based on faulty assumptions. Environmental advocates warn that reversing the rules will lead to increased fuel costs, fewer clean-vehicle options, and higher levels of pollution.
The fuel economy debate is unfolding alongside renewed political tension over EV policies. A recent public exchange between Donald Trump and Tesla CEO Elon Musk highlights the divide, particularly as new budget proposals threaten to roll back EV tax credits.
Fuel economy standards, first enacted in response to the 1970s energy crisis, are a core element of U.S. transportation policy. Transportation remains the nation’s largest source of greenhouse gas emissions, with cars and trucks responsible for over half of those emissions. While automakers have made strides in improving the efficiency of gas-powered vehicles, the rollback of these rules could hinder further environmental progress.
