Automakers have argued that the rules could result in the loss of up to 1 million jobs because consumers could be less willing to buy the more fuel efficient vehicles since their engineering will result in higher price tags.
The EPA had until April 2018 to decide whether the 2025 standards were feasible but in November moved up its decision to Jan. 13, just before Obama left office.

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This one must be fun for Trump’s team, given the determination by the prior administration to seal the EPA in a battle with automotive. If only we could build whole cars from carbon fiber like we do bicycles.