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In December 2016, the National Highway Traffic Safety Administration (NHTSA) finalized a rule that updates civil penalties for car manufacturers that violate fuel economy standards. NHTSA is now reconsidering the rule, claiming it would have a significant negative economic impact. The agency provides no evidence that economic circumstances have changed since the rule’s finalization to make the rule more costly. Our comments argue that the agency should not proceed with the proposed reconsideration, because it inadequately explained why it changed positions. If the agency does continue with the reconsideration, both the Inflation Adjustment Act and economic cost-benefit analysis would justify an update to the penalties rates rather than maintaining the original penalty rate from 1975.