WASHINGTON, D.C.—President Donald J Trump, on December 3, announced a major rollback of the Biden administration’s Corporate Average Fuel Economy (CAFE) standards, terminating the aggressive fuel-efficiency requirements and returning the program to levels achievable with conventional gasoline and diesel vehicles.

The Biden-era standards, Trump called a “scam” during the Wednesday’s presser, were finalized in 2022 by the National Highway Traffic Safety Administration for model years 2024–2026 and required fleet-wide fuel efficiency averages on new vehicles to rise to approximately 52–55 mpg for passenger cars and 42–45 mpg for light trucks by 2026 — a roughly 10 mpg increase from 2021 levels. Administration officials contend those targets effectively functioned as a backdoor electric-vehic

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