Vehicle greenhouse-gas standards repealed

Summary

The February 2026 Endangerment Finding rescission simultaneously repealed all federal GHG emission standards for light-, medium-, and heavy-duty vehicles through model year 2027+. Separately, in December 2025, NHTSA proposed a rollback of federal Corporate Average Fuel Economy (CAFE) standards.

What happened

EPA said the Biden EPA's 2024 tailpipe standards for model year 2032 represented a nearly 50% reduction in projected light-duty fleet-average GHG emissions compared with the model year 2026 standards. The Trump EPA's February 2026 final rule repealed these standards for model years 2027+. In December 2025, NHTSA also proposed a separate rollback of fuel economy (CAFE) standards. EPA's own pre-rollback analysis of the Biden standards found they would avoid more than 7 billion tons of carbon emissions, save the average buyer $6,000 in fuel and maintenance, and prevent up to 2,500 premature deaths in 2055.

Impact on the United States

EPA's 2024 analysis projected the repealed standards would save the average driver about $6,000 in fuel and maintenance over a vehicle's life and reduce fine particulate matter and ozone, preventing up to 2,500 premature deaths in 2055; those projected benefits are forgone.

Documented effects

1. EPA's 2024 projections: the repealed standards would save the average driver about $6,000 in fuel and maintenance over a vehicle's life, avoid more than 7 billion tons of carbon emissions, and prevent up to 2,500 premature deaths in 2055.[1]
2. Dec 2025NHTSA separately proposed a CAFE rollback in December 2025, compounding the weakening of fuel efficiency requirements for new vehicles.[2][3]

Why this is rated severe

Repealing vehicle GHG standards forgoes EPA-projected ~$6,000 in lifetime fuel and maintenance savings per driver and up to 2,500 prevented premature deaths in 2055, a severe enacted harm.

same final rule as endangerment finding rescission

Corrections & updates [5]

Every change to a fact on this page after publication is logged here, newest first.

1. Sep 29, 2026CorrectedSource

   Source s1 linked to a March 2020 Sabin Center page about the first-term SAFE rule, which contains none of the cited figures. It is replaced with EPA's March 20, 2024 announcement of the standards, which gives 7.2 billion tons of CO2 avoided through 2055, $6,000 average lifetime savings per driver, and 2,500 premature deaths prevented by 2055.[1]

2. Sep 29, 2026CorrectedFigure

   EPA's projection was up to 2,500 premature deaths prevented through 2055 (cumulative), not 2,500 per year.[1]

3. Sep 29, 2026CorrectedKey facts

   NHTSA proposed, but has not finalized, its passenger-car and light-truck fuel-economy rollback (the 'SAFE Vehicles Rule III', published as a proposed rule on December 5, 2025). No final rule appears in the Federal Register as of September 29, 2026.[2][3]

4. Sep 29, 2026CorrectedFigure

   Corrected to match EPA's 2024 announcement: the standards were projected to prevent up to 2,500 premature deaths in 2055 (not cumulatively by 2055), to save the average driver about $6,000 in fuel and maintenance, and to avoid more than 7 billion tons of carbon emissions. The '85 grams per mile' figure and the claim that the rule effectively mandated an EV sales share are not in the cited source; EPA described a nearly 50% cut in projected light-duty fleet-average GHG emissions from MY 2026 levels. Removed an unsourced passage about a two-tier California market and an unsourced foreign linkback. The NHTSA fuel-economy rollback is a proposal, so the headline no longer says fuel-economy standards were repealed.[1][2]

5. Sep 29, 2026CorrectedCost estimate

   Removed the $5B 'so far' figure: it assumed 2026 cars were sold under a finalized December 2025 fuel-economy rollback, but that rollback is still only a proposal, and the repealed EPA standards only applied from model year 2027. Removed an unsourced federal-cost projection. EPA's own final analysis shows lower car prices offset forgone fuel savings in the first decade, so no net consumer cost is booked to 2035. The broader cost is now the lost air-quality health benefit, from EPA's 2024 estimate of $13B a year, scaled to the share of the emissions increase that happens by FY2035.

   Previously

   $5B so far; $8B / $12B federal 10yr/15yr; $90B broader 10yr

   Now

   $0 so far; $0 federal 10yr/15yr; $65B broader 10yr

Sources [3]