On December 3, 2025, President Trump unveiled an NHTSA proposal to slash Biden-era CAFE standards, cutting the 2031 target from about 50.4 mpg to roughly 34.5 mpg. The rule also slows annual increases to 0.25–0.5% from 2% and bans credit trading after 2028, which especially hurts EV-focused companies that sell credits to gasoline-heavy manufacturers.
The White House frames the move as ending an alleged 'EV mandate,' lowering sticker prices, and saving families around $1,000 per vehicle. This builds on earlier actions to zero out CAFE penalties, terminate federal EV tax credits, and block California's planned 2035 gas-car sales ban.
However, federal analyses project that the rollback would drive about 100 billion extra gallons of gasoline consumption through 2050 and cost drivers up to $185 billion more at the pump. Carbon dioxide emissions would rise roughly 5% versus the Biden rule. This transforms a central pillar of U.S. climate and transport policy into a high-stakes legal and political fight.
2031 fleetwide fuel‑economy target (Trump proposal vs. Biden rule)
NHTSA’s new proposal would cap light‑duty CAFE at about 34.5 mpg in 2031 instead of the ~50.4 mpg level finalized in 2024 under President Biden.
100B gallons
Additional gasoline use through 2050
NHTSA estimates the rollback would cause vehicles to burn roughly 100 billion more gallons of fuel by 2050 compared with the Biden standards.
$185B
Extra fuel costs to drivers through 2050
Regulators project that weaker standards could cost Americans up to $185 billion more in fuel purchases over coming decades, even after somewhat lower vehicle prices.
$109B
Savings claimed by White House over 5 years
The Trump administration says its CAFE reset, combined with other actions, will save families $109 billion over five years, an estimate heavily disputed by environmental and consumer advocates.
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21 events
Latest: December 12th, 2025 · 5 months ago
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December 2025
NHTSA Announces January Public Hearing on CAFE Rollback
LatestRegulatory Process
NHTSA publishes notice of virtual public hearing scheduled for January 7–8, 2026, to collect oral comments on the proposed CAFE reset and accompanying environmental impact statement. Written comments due January 20, 2026.
CAFE Reset Formally Published in Federal Register
Regulatory Proposal
NHTSA's proposed SAFE Vehicles Rule III for model years 2022–2031 is formally published in the Federal Register, opening the official public comment period and revealing detailed regulatory text showing 0.5% annual increases through 2026, then 0.25% through 2031, with elimination of inter-manufacturer credit trading starting MY 2028.
Analyses Highlight Higher Fuel Use and Costs Under Rollback
Impact Analysis
Follow‑up analyses and a related NHTSA document suggest the rollback could increase gasoline use by 100 billion gallons, cost drivers up to $185 billion more in fuel, and raise CO₂ emissions by about 5% versus the Biden rule, even as it saves automakers roughly $35 billion through 2031.
Trump Announces CAFE Reset Proposal
Regulatory Proposal
President Trump and Transportation Secretary Sean Duffy unveil NHTSA’s proposal to reduce the 2031 light‑duty CAFE target from about 50.4 mpg to 34.5 mpg, revise prior‑year standards, and phase out fuel‑economy credit trading by 2028, arguing it will lower car prices and end an “EV mandate.”
October 2025
California Files Amended Complaint in Waiver Lawsuit
Legal
California and coalition states file amended complaint in their lawsuit challenging the Congressional Review Act revocation of EPA waivers for Advanced Clean Cars II, Advanced Clean Trucks, and Omnibus Low NOx rules, mooting a pending federal motion to dismiss and pushing resolution into early 2026.
September 2025
Federal EV Purchase Credits Expire
Policy Sunset
Federal tax credits for new, used, and leased EVs expire under Trump’s tax law, removing a major financial incentive for EV adoption in the U.S. even as other countries continue to subsidize electric vehicles.
EPA Endangerment Finding Comment Period Closes
Regulatory Process
EPA's extended public comment period on the proposal to rescind the 2009 Endangerment Finding and all vehicle GHG standards closes after receiving thousands of comments during August public hearings and written submissions.
August 2025
EPA Holds Multi-Day Endangerment Finding Hearings
Regulatory Process
EPA conducts virtual public hearings on August 19–21 (with potential fourth day August 22) on its proposal to rescind the 2009 Endangerment Finding, drawing extensive testimony from scientists, state officials, environmental groups, and industry representatives.
Zero Emission Transportation Association Sues Over CAFE Interpretive Rule
Legal
Zero Emission Transportation Association files lawsuit challenging NHTSA's June interpretive rule that excludes EVs from CAFE compliance calculations; case consolidated with earlier California and Center for Biological Diversity suits in the First Circuit.
EPA Endangerment Finding Rescission Published in Federal Register
Regulatory Proposal
EPA formally publishes its proposal to rescind the 2009 Endangerment Finding in the Federal Register, arguing that Clean Air Act Section 202(a) does not authorize EPA to regulate GHGs for climate purposes and that scientific developments cast doubt on the original findings.
July 2025
EPA Proposes Rescinding Endangerment Finding and Vehicle GHG Standards
Regulatory Rollback
At an Indiana auto dealership, EPA proposes to rescind the 2009 Endangerment Finding and repeal all light‑, medium‑ and heavy‑duty vehicle GHG standards, claiming it will save Americans $54 billion annually and end a supposed EV mandate.
‘Big Beautiful Bill’ Ends Federal EV Tax Credits
Legislation
Trump signs tax legislation that eliminates up‑to‑$7,500 EV purchase credits (and related used/leased EV incentives) after September 30, 2025, accelerating a short‑term rush in EV sales before the deadline.
June 2025
California and Environmental Groups Sue Over CAFE Interpretive Rule
Legal
State of California and Center for Biological Diversity file separate lawsuits in different circuits challenging NHTSA's interpretive rule regarding medium- and heavy-duty vehicles, credit trading, and EV treatment in CAFE calculations; suits later consolidated in First Circuit.
Congress and Trump Block California’s 2035 Gas‑Car Ban
Legislative Action
Trump signs multiple Congressional Review Act resolutions overturning California’s rules phasing out sales of new gasoline cars by 2035 and related EV mandates, prompting immediate legal challenges from California and allied states.
NHTSA Issues CAFE Interpretive Rule
Regulatory Framing
NHTSA publishes “Resetting the Corporate Average Fuel Economy Program,” asserting that prior administrations improperly used CAFE to enforce an EV mandate and clarifying the agency’s authority to revisit standards that counted EVs in compliance.
March 2025
Trump EPA Moves to Reconsider Endangerment Finding
Regulatory Opening Shot
EPA Administrator Lee Zeldin announces a formal reconsideration of the 2009 Endangerment Finding and other climate rules, calling it a necessary review of the scientific and legal basis for greenhouse‑gas regulation.
NHTSA under Biden finalizes new CAFE standards for model years 2027–2031, requiring the light‑duty fleet to reach about 50.4 mpg by 2031 and projecting over $23 billion in fuel‑cost savings for drivers.
April 2024
EPA Issues Multi‑Pollutant Tailpipe Rule for 2027–2032
Regulatory Action
EPA finalizes stringent multi‑pollutant standards for light‑ and medium‑duty vehicles starting in model year 2027, using EV adoption as a key compliance pathway and projecting large climate and health benefits.
March 2020
SAFE Vehicles Rule Slows Obama‑Era Increases
Regulatory Rollback
During Trump’s first term, NHTSA and EPA finalize the SAFE Vehicles Rule, cutting the required annual increase in fuel‑economy and GHG standards for model years 2021–2026 to 1.5% from roughly 5%, and previously moved to revoke California’s waiver to set its own GHG and zero‑emission vehicle rules.
August 2012
Obama Finalizes 54.5‑mpg by 2025 Standards
Regulatory Action
The Obama administration finalizes joint EPA–NHTSA standards that will raise fleetwide fuel economy to the equivalent of 54.5 mpg for cars and light trucks by model year 2025, nearly doubling efficiency compared with then‑current vehicles.
December 2009
EPA Issues Greenhouse Gas Endangerment Finding
Regulatory Foundation
EPA formally determines that six greenhouse gases endanger public health and welfare and that vehicle emissions contribute to that pollution, creating the legal basis for federal vehicle GHG standards under the Clean Air Act.
Historical Context
3 moments from history that rhyme with this story — and how they unfolded.
1 of 3
2011–2012
Obama’s 54.5‑mpg Clean‑Car Deal (2011–2012)
In 2011–2012, President Obama brokered and finalized a landmark agreement with major automakers, EPA, and NHTSA to nearly double U.S. fleet fuel efficiency to the equivalent of 54.5 mpg by model year 2025. The rule was projected to save consumers more than $1.7 trillion at the pump and cut 6 billion metric tons of CO₂ over the life of the program.
Then
Automakers publicly supported the standards and began planning for a more efficient, partially electrified fleet; average new‑vehicle fuel economy rose, though not as quickly as hoped.
Now
The Obama standards became a central target for later Trump rollbacks and were only partially implemented before being weakened in 2020 and reshaped again by Biden and Trump’s second term, illustrating how even broad consensus deals can be undone over time.
Why this matters now
The 2012 deal shows that industry, states, and environmentalists can converge on ambitious standards—but also how subsequent administrations can unravel that consensus, leading to the policy whiplash visible in the 2025 CAFE reset.
2 of 3
1985–1987
Reagan‑Era Fuel Economy Rollback (Mid‑1980s)
In the mid‑1980s, NHTSA under the Reagan administration lowered the passenger‑car CAFE standard from 27.5 mpg to 26 mpg for the 1986 model year after intense lobbying from GM and Ford, which argued they could not meet the stricter target without major production cuts and job losses. The nominal 27.5‑mpg standard was later restored, but actual fleet efficiency stagnated around that level for roughly two decades.
Then
The rollback saved automakers from immediate penalties and allowed continued production of larger, less efficient vehicles, pleasing consumers at a time of low gasoline prices.
Now
Years of flat standards led to lost oil‑savings opportunities; later analyses suggested that modestly higher standards in that period could have avoided millions of barrels per day in oil consumption.
Why this matters now
The 1980s episode demonstrates that even seemingly small downward adjustments in CAFE can lock in long‑lasting plateaus in fuel efficiency and oil demand—an important precedent for understanding how a 34.5‑mpg cap in 2031 could shape U.S. emissions for decades.
3 of 3
2018–2021
Trump’s 2020 SAFE Vehicles Rule and California Waiver Fight
In his first term, Trump replaced Obama’s clean‑car standards with the SAFE Vehicles Rule, which slowed annual efficiency improvements to 1.5% for 2021–2026 and sought to revoke California’s waiver to set its own GHG and ZEV rules. California and other states sued, and several automakers sided with California in a voluntary agreement for somewhat stronger standards.
Then
The SAFE rule modestly slowed efficiency gains and created deep uncertainty for automakers caught between federal and California trajectories; litigation over the waiver revocation remained unresolved when Biden took office.
Now
The Biden administration restored California’s waiver and re‑tightened standards, but Trump’s 2020 actions previewed the legal and political arguments now being used again in the 2025 rollback, including claims about affordability and federal preemption of state rules.
Why this matters now
This earlier cycle shows both the vulnerabilities and limits of presidential power over auto standards: a determined administration can soften rules quickly, but subsequent administrations and courts can reverse course. It foreshadows the likely litigation and potential reversals facing Trump’s 2025 CAFE reset and EPA deregulatory push.
