The Trump administration is moving to significantly loosen US fuel economy requirements for cars and light trucks, opening another major chapter in the federal government's effort to change the regulatory direction of the American automobile industry. The administration is expected to release revised Corporate Average Fuel Economy, or CAFE, standards on September 28, 2026, reducing the efficiency targets that had been set under the Biden administration. The change would give automakers more flexibility to sell gasoline-powered vehicles while reducing the regulatory pressure that had encouraged manufacturers to develop and market more fuel-efficient models and electric vehicles.
At the centre of the change is the 2031 fleetwide fuel-economy target. The National Highway Traffic Safety Administration's earlier Trump-era proposal projected an average of about 34.5 miles per gallon for light-duty vehicles in model year 2031, compared with approximately 50.4 mpg under the Biden-era rules finalized in 2024. The difference represents a substantial change in the regulatory trajectory and would reduce the rate at which manufacturers are required to improve average fuel efficiency across their fleets. Reuters reported that the administration's final rule was expected to follow the broad direction of that proposal.
The precise final regulatory text was not available in the sources reviewed when the administration's September 28 rollout was first reported, so the 34.5 mpg figure remains the clearest publicly documented numerical guide to the planned changes rather than a substitute for the final rule itself. NHTSA's public CAFE materials describe the reset as an effort to reconsider existing standards for model years 2022 through 2031 and to align the programme with the administration's interpretation of federal law.
President Donald Trump has presented the move as an affordability and manufacturing measure. In a September 26 social-media post, he said the less stringent requirements would remove what he characterized as unnecessary costs from vehicle production and help lower the price of new cars while supporting US auto manufacturing. Transportation Secretary Sean Duffy has similarly described the administration's “Freedom Means Affordable Cars” initiative as an effort to increase consumer choice and reduce regulatory burdens on automakers.
The administration's argument is built around the economics of vehicle production. Automakers that need to meet more stringent fleetwide efficiency requirements may have to invest in more efficient engines, lighter materials, hybrid systems or electric vehicles. By lowering the targets, the government says manufacturers will have greater freedom to decide which technologies and vehicle types best match consumer demand. The December 2025 Department of Transportation proposal estimated that its broader reset could save about $109 billion over five years and reduce the average cost of a new vehicle by roughly $1,000. Those figures are government estimates, not guaranteed savings for buyers.
The regulatory change comes at a difficult moment for American car buyers. The average new vehicle sold for $50,089 in August, according to Kelley Blue Book data cited by AP, crossing the $50,000 threshold. At the same time, gasoline prices have risen as the Middle East conflict disrupts global energy supplies. The national average price for regular gasoline stood at about $4.47 a gallon on September 27, according to AAA data cited by AP. The combination of expensive vehicles and expensive fuel makes the debate over fuel efficiency particularly relevant to consumers.
The policy is a major reversal from the trajectory established by the Biden administration. NHTSA's 2024 rules required passenger-car fuel economy to increase 2% annually during model years 2027 through 2031, while light trucks were scheduled for 2% annual increases in model years 2029 through 2031. Those standards were designed to bring the projected overall industry average to about 50.4 mpg by 2031. Heavy-duty pickup trucks and vans were also subject to increasingly stringent requirements through 2035.
The Trump administration's proposed reset uses a much slower improvement schedule and changes how the CAFE programme accounts for different technologies. NHTSA's proposal would set new standards beginning with revised model-year 2022 levels, followed by annual increases of roughly 0.25% in later years. It would also remove the inter-manufacturer credit-trading system beginning in model year 2028 and change aspects of how vehicle fleets are classified. The administration says the changes would make compliance more straightforward and remove what it views as inappropriate reliance on electric-vehicle performance when calculating fuel-economy requirements.
The distinction between CAFE standards and vehicle emissions rules is important. CAFE is administered by NHTSA and measures how far vehicles must travel on a gallon of fuel. Separate greenhouse-gas and pollution requirements have historically been administered by the Environmental Protection Agency. The Trump administration has already taken action affecting the second category. In February 2026, EPA finalized the rescission of the 2009 greenhouse-gas endangerment finding and repealed subsequent federal vehicle greenhouse-gas standards under the Clean Air Act.
Together, those actions create a substantially different federal regulatory environment for vehicle manufacturers. Automakers will have fewer federal incentives to increase fleetwide efficiency through higher fuel-economy performance or lower vehicle greenhouse-gas emissions. The administration argues that consumers will benefit from greater access to gasoline-powered cars and trucks, while critics say the changes could increase long-term fuel consumption and emissions.
NHTSA estimates that the proposed lower standards could reduce the upfront cost of an average vehicle by about $930. At the same time, the agency projected that the changes would result in roughly 100 billion additional gallons of fuel consumption through 2050 and a 5% increase in carbon dioxide emissions compared with the prior regulatory path. Those estimates illustrate the central economic trade-off surrounding the policy: lower regulatory costs at the time of vehicle production versus potentially higher fuel consumption over the life of the vehicle.
Environmental organizations have criticized the planned rollback. The Center for Biological Diversity said the weaker standards ignore the feasibility of cleaner vehicle technologies and could result in higher fuel costs for drivers. The Sierra Club has similarly argued that less efficient vehicles would consume more gasoline and increase pollution. Those are advocacy-group assessments, while the administration and auto-industry supporters have emphasized lower vehicle costs, manufacturing flexibility and consumer choice.
The timing of the change creates another important issue: energy prices are already elevated. US diesel prices have reached record levels this month, while gasoline prices have also risen as the conflict involving Iran disrupts international fuel flows. A less-efficient vehicle therefore carries a different economic calculation when fuel itself is expensive. Buyers may save money at purchase but spend more on gasoline over time, depending on driving patterns and fuel prices.
The automobile industry's reaction is more complicated than a simple divide between supporters and opponents. Major manufacturers have previously argued that existing regulations need to reflect real-world consumer demand and the pace of electric-vehicle adoption. At the same time, automakers have invested billions of dollars in hybrid, electric and fuel-efficient technologies over the past decade. A major change in federal standards can therefore affect long-term product planning and factory investment decisions even when companies broadly support greater regulatory flexibility.
Ford, General Motors and Stellantis have extensive businesses built around pickup trucks and SUVs, vehicle categories that can be difficult to make highly fuel-efficient compared with smaller passenger cars. The relaxed standards could give those companies more room to maintain or expand gasoline-powered offerings. But they still have to respond to consumer demand, state regulations, global efficiency rules and competition from manufacturers that continue investing heavily in electric vehicles.
Electric-vehicle manufacturers face a different environment. The federal government has already ended consumer tax credits for EV purchases acquired after the relevant eligibility deadline, reducing one source of federal support for demand. California's ability to set its own zero-emission vehicle requirements has also been challenged by the Trump administration, which argues that federal law preempts state fuel-economy regulation. The state is contesting that position in court, creating another layer of uncertainty for manufacturers operating across the US market.
California's role is particularly important because the state has historically operated some of the most demanding vehicle environmental rules in the United States. The Trump administration sued California in March, arguing that its zero-emission and tailpipe greenhouse-gas requirements were preempted by federal law. The outcome of that litigation could affect how much freedom states retain to impose requirements that differ from federal policy.
The regulatory rollback also has implications for the competitiveness of US automakers. Manufacturers are competing in a global market where Europe, China and other major regions continue to develop efficiency and electric-vehicle standards. Supporters of the Trump approach argue that US companies need freedom to build the vehicles domestic customers actually buy. Opponents argue that weaker standards could reduce incentives for American manufacturers to invest in technologies that are increasingly important in international markets. The long-term effect will depend on how federal rules interact with global demand and competition.
For consumers, the policy could change the mix of vehicles available in US dealerships over several years. Automakers may have more freedom to devote production capacity to larger gasoline-powered SUVs and pickups without facing the same fleetwide efficiency pressure. That does not mean electric vehicles will disappear. Manufacturers can continue producing EVs where customer demand and corporate strategy justify them. The likely effect is instead a different balance between gasoline, hybrid and electric models.
Fuel demand is another major variable. If a larger proportion of new vehicles consume more gasoline, US petroleum demand could remain higher than it otherwise would have been. That could increase the importance of domestic refining capacity and international oil supplies. The effect will build gradually because vehicle fleets turn over slowly, but NHTSA's long-term estimates indicate that cumulative fuel consumption could become substantially larger over several decades.
There is a particular irony in the current timing. The administration is loosening fuel-economy requirements while American motorists are experiencing an unusually sharp increase in fuel prices. That does not necessarily determine whether the regulation will achieve its stated affordability goals, but it makes the lifetime cost of vehicle ownership a central part of the debate. A lower purchase price and higher fuel expenditure affect consumers at different points in time.
The change also intersects with the wider US energy policy. The Trump administration has consistently emphasized increasing domestic energy production and reducing regulatory barriers around fossil fuels. The CAFE rollback fits that broader approach by reducing federal pressure on manufacturers to improve gasoline consumption rapidly. The administration says the policy is intended to give the market greater freedom rather than dictate the technologies consumers should use.
For investors, the key issue is how automakers adjust their product strategies. A less restrictive CAFE regime could reduce some compliance costs and give manufacturers additional flexibility over high-margin trucks and SUVs. But companies will still have to manage fuel-price risk, consumer preferences, global competition and state-level regulations. The financial impact will therefore vary by manufacturer and by the composition of each company's fleet.
The transition will not happen overnight. CAFE standards apply to vehicle model years, and manufacturers make product decisions several years before vehicles reach dealerships. Even after a final rule is issued, companies will need to adjust engineering plans, production schedules and compliance strategies. That means the consequences of today's policy decision will emerge gradually rather than appearing immediately in showroom inventories.
Legal challenges are another possibility. Environmental and consumer groups have already signaled opposition, and questions about the authority of NHTSA and the interaction between federal and state vehicle regulations are likely to generate further litigation. Previous changes to fuel-economy and emissions rules have also taken years to work through courts and federal rulemaking. The final regulatory framework could therefore remain subject to legal uncertainty even after publication.
The broader business significance is clear: Washington is changing the incentives that helped shape the US auto industry's move toward greater efficiency and electrification. The proposed 34.5 mpg 2031 average is dramatically below the 50.4 mpg trajectory established in 2024, and the administration says the reset will reduce regulatory costs and expand consumer choice. Critics counter that lower efficiency could increase long-term fuel spending and emissions.
The outcome will ultimately depend on how automakers, consumers and energy markets respond. Manufacturers could use the flexibility to expand traditional gasoline vehicles, continue investing in hybrids or pursue EVs based on market demand. Consumers will weigh upfront prices against fuel and ownership costs. Energy companies will watch whether higher vehicle fuel consumption translates into stronger long-term gasoline demand. And regulators and courts will determine how durable the new framework becomes.
For the American auto industry, the September 28 move represents a substantial shift in the rules governing vehicle efficiency. It offers manufacturers more freedom in what they build while reducing the federal pressure to achieve rapid improvements in fuel economy. Whether that produces cheaper vehicles, stronger domestic production, higher fuel consumption or a different mix of technologies will become clearer as the new standards take effect and companies begin adapting their product plans.
**What to Watch Next:**
The immediate milestone is publication of the final NHTSA rule and its exact requirements for model years 2022 through 2031. Investors will then watch automaker product plans, fuel-demand forecasts, gasoline prices and potential legal challenges. Developments in California's separate vehicle-regulation case will also be important because the interaction between federal and state requirements could determine how uniformly the new fuel-economy policy applies across the US market.
