The Trump administration released a law on Monday to reduce the fuel economy standards that were established during the Biden era. This action was taken with the claim that the Biden administration "illegally set standards that exceeded the legal requirements of Congress" and also because they were pursuing electric vehicles that Americans were not interested in.
Details of the New Law
This announcement, made by Shawn Duffy, the Secretary of Transportation, stated that previous regulations had imposed significant costs on automakers. The new changes are designed to reduce costs and encourage manufacturers to increase production in the United States. Duffy claimed that these reductions would, in turn, make new cars more accessible to Americans.
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This law, first proposed in December 2025, has drawn various reactions, receiving strong criticism from environmental advocates and praise from automotive industry trade groups. The administration finalized this law last week with the approval of President Donald Trump.
Economic and Environmental Implications
President Trump stated on September 26 regarding this new law that the new standards "eliminate waste from the car manufacturing process in America." He wrote on his social media: "This means lower prices and savings for families buying a new, beautiful, and safe car." However, the claim of reduced costs for American buyers depends on various factors, including automakers' pricing decisions, fuel costs, and overall economic conditions.
Biden's regulations in 2024 were aimed at reducing greenhouse gas emissions from vehicles, decreasing dependence on fossil fuels, and stimulating the transition to electric and hybrid vehicles. The Trump administration has claimed that the new changes focus more on strengthening the automotive industry and access to new and safe vehicles.
Reducing pressure on automakers to improve fuel efficiency or sell more hybrid and electric vehicles to meet overall standards is another consequence of this law. Two federal agencies have traditionally set rules that affect fuel consumption and pollution levels produced by vehicles. The Environmental Protection Agency (EPA) regulates vehicle pollution and had previously limited the reduction of greenhouse gas emissions from vehicles. The Department of Transportation (DOT) sets fuel economy standards.
The Corporate Average Fuel Economy (CAFE) standards of the Department of Transportation apply to the average fuel efficiency of new cars and light trucks of an automaker. These standards ensure that if an automaker sells an inefficient vehicle, they must also sell efficient vehicles to meet the average standard. The standards set under the new infrastructure differ significantly from what the Biden administration had anticipated.
Environmental advocates have pointed to these changes as a sign of the Trump administration's diminishing priorities regarding environmental protection, as electric vehicles produce fewer greenhouse gases compared to traditional fossil fuel vehicles. In July 2025, Trump's "One Big Beautiful Law" eliminated the $7,500 tax credit for electric vehicles, and in the same month, the administration removed penalties for automakers that fail to comply with federal fuel efficiency requirements.
The Trump administration believes that the CAFE standards of the Biden era overestimated consumer demand for electric vehicles. Sam Fiorani, Vice President of Global Vehicle Forecasting at AutoForecast Solutions, states that this issue is more complex than it appears.
According to the Department of Transportation, the reduced fuel economy standards of the Trump administration will save Americans $138 billion over the next five years and reduce the average cost of purchasing a new vehicle by $1,300. These developments come as trade groups representing automakers have supported these changes.
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