Washington — Amid a teardown of auto industry environmental rules, Trump administration allies quietly won another victory when a federal court voided an obscure but, at one point, hugely consequential Biden-era rule on electric vehicles.

A panel of judges for the 8th Circuit Court of Appeals in St. Louis nullified a March 2024 change to "petroleum equivalency factor" rules, which determine electric vehicles' miles-per-gallon rating. After a phase-in window ending in 2030, MPG ratings for EVs would have been about 65% lower.

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