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The US Department of Transportation finalized a rule weakening fuel efficiency standards for cars and trucks, cutting CAFE requirements back to roughly 35 mpg — down from the 40 mpg standard set under Trump in 2020 and far below Biden-era targets. Officials called it among the largest deregulatory actions of the second Trump administration. The rollback effectively guts Biden-era fuel economy rules and is expected to reduce automakers' incentives to improve vehicle efficiency, drawing criticism from environmental advocates.