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WASHINGTON — April 2, 2025
The Trump administration has finalized a sweeping rollback of U.S. fuel efficiency rules, requiring automakers to improve their fleets by just 1% per year and reach an average of 34.9 miles per gallon by model year 2031. The rule, issued by the National Highway Traffic Safety Administration (NHTSA) on Monday, replaces the Biden-era mandate of 2% annual gains and a 50.4 mpg target.
Under the old standards, automakers faced steep fines if they missed the targets. Meeting them meant a mix of smaller engines, lighter materials, hybrid systems and a heavy dose of electric vehicles. The new framework drops the annual improvement rate to a single percentage point, which the agency says is the maximum that keeps vehicles affordable.
Trump officials frame the move as a pocketbook issue. NHTSA estimates that looser standards will shave about $1,300 off the average sticker price. "This administration is delivering relief to families and reviving the beating heart of American manufacturing," Transportation Secretary Sean Duffy said in a statement. President Trump echoed that on Truth Social over the weekend, promising "LOWER PRICES" and savings of "thousands" for buyers of "a new, beautiful, and safe car."
The agency's final rule adds that the old system had been pushing consumers out of an already unaffordable new car market, adding inefficiency and cost to vehicles that families neither wanted nor needed.
Environmental groups were quick to slam the rule. Dan Becker, head of the Safe Climate Transport Campaign at the Center for Biological Diversity, said the rollback will mean more gasoline burned, more pollution and higher costs for drivers and for society. "Trump is tanking sensible mileage standards at the worst possible time" for consumers, he said, with gas prices already painfully high.
Indeed, AAA data from this week shows the national average price for regular gasoline close to $4.50 a gallon, with diesel hovering around $6.50 — just a hair below last week's record high.
The rule arrives with a long legal shadow. The Biden standards were upheld in court after a previous Trump attempt to gut them. This new version could face the same path. Watchdogs and Democratic state attorneys general are widely expected to argue that NHTSA violated the statutory command to set standards at the "maximum feasible" level.
A court fight could take years, delaying the rule's effective date. Or a future administration could reverse course again, adding to the regulatory whiplash automakers have experienced since 2017.
The rollback also reopens a familiar split between Washington and California. The Golden State was granted a Clean Air Act waiver under Biden to enforce its own strict vehicle emission rules. That waiver has since been revoked by the Trump administration, but California regulators are fighting in court. If they prevail, carmakers could face one efficiency benchmark in California and a weaker one in the rest of the country, turning compliance into a logistical headache.
Can the administration's promise of cheaper cars survive scrutiny? Sue Helper, an economist at Case Western Reserve University who studies the auto industry, believes the sticker-price problem is real but misdiagnosed. New cars have gotten expensive for many reasons, she says: buyers are choosing bigger vehicles, supply chains and tariffs have pushed costs up, and infotainment systems add thousands of dollars. Fuel-efficiency hardware is only a small part of the price hike.
A 2023 analysis by Consumer Reports found that while fuel economy improved by about 30% across model years 2003 to 2021, the price surge during that period tracked the industry's pivot to SUVs more than the cost of efficiency technology.
There is also the financing problem. The Federal Reserve's benchmark rate is still high, and the average auto loan carries a hefty interest charge. Ellen Hughes-Cromwick, who spent much of her career as Ford's chief global economist and is now a senior visiting fellow at the Third Way think tank, says monthly payments are what drivers actually feel. A $1,300 discount is helpful, but it doesn't move the needle much against a 7% financing rate.
And then there's gasoline. A simple calculation: a car averaging 34.9 mpg burns roughly 430 gallons over 15,000 miles. A car at 50.4 mpg burns about 300 gallons. At $4.50 a gallon, that's a $585 difference every year. In about two years, the promised sticker savings are gone. If gas prices rise further — quite possible given the war in Iran — the math gets worse for motorists.
For American carmakers, today's rule is a mixed bag. In the short term, it takes pressure off their profitable pickup trucks and large SUVs. But those are exactly the vehicles that struggle in export markets.
The Alliance for Automotive Innovation, whose members include Ford, General Motors and Stellantis, called the rule "an appropriate course correction" and praised NHTSA for aligning the standards with market realities. Yet the same trade group acknowledges that the global industry is moving toward electrification, with Chinese EV makers now a powerful competitive force.
Helper described the U.S. under these rules as a "protected little Galapagos of an ecosystem," where automakers can sell gas guzzlers without much challenge. That might protect quarterly profits, she said, but it also reduces the incentive to master technologies that dominate the rest of the world. "It's very bad in the long term, because it slows progress."
This is not the first time CAFE standards have swung with the political pendulum. The program dates back to 1975, when Congress adopted fuel economy rules after the Arab oil embargo exposed U.S. reliance on foreign petroleum. National security was the original rationale; climate change became the driver in the 2010s. Since then, Washington has moved the targets up under Democratic administrations and down under Republican ones — not exactly a recipe for long-term industrial planning.
Under Biden, the CAFE rules effectively forced automakers to sell EVs to offset gas-hungry trucks, or pay penalties. That penalty provision was removed last July as part of the One Big Beautiful Bill Act, which critics said defanged the rules before a full rewrite was possible. Then, in December, the White House proposed the changes that NHTSA has now finalized, plus a new twist: automakers can no longer trade compliance credits among themselves.
That credit-trading system, which allowed traditional manufacturers to buy credits from Tesla and other EV-only companies, had become a lightning rod in Congress. Republicans called it a subsidy for Tesla; environmentalists called it a loophole. The final rule ends it. That could matter for automakers that had planned their lineups around credit purchases.
The rule still has to be published in the Federal Register, a step that usually happens within days. At that point, the clock starts for legal challenges. States, environmental groups and possibly even some automakers could file suit. Meanwhile, the EPA is separately reconsidering greenhouse gas standards that align with CAFE targets; a similar rollback there is expected later this year.
For car buyers, the practical impact will not be immediate. Showrooms won't suddenly fill with less efficient cars. Product cycles are five to seven years, and automakers already locked in engineering decisions for upcoming models. The differences will appear gradually, in how quickly trucks and SUVs become more efficient and how aggressively EVs are marketed.
The bigger question is strategic. Automakers must decide where to spend billions of dollars in research and development. If the U.S. standard is weak but markets in Europe and China demand low-emission vehicles, they will need to keep building efficient cars anyway. The regulation, in that sense, might be less important than what happens on the road and in the showroom.
Trump's team calls the new rule a relief for working families. Its critics call it a giveaway to polluters. The data, at least at the pump, will show up in the next few years — and in the legal briefs even sooner.
