fuel efficiency

The Trump Administration today moved to weaken fuel economy standards for automobiles, saying the current ones are inappropriate and wrong.

The long-anticipated move is a win for auto manufacturers, which had lobbied for lower fuel-economy standards. It's also a rejection of one of former President Barack Obama's biggest efforts to combat climate change by curbing greenhouse gas emissions.

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From NPR: You won’t see fins on the back of your car anytime soon. They disappeared for a reason: better aerodynamics equals better fuel efficiency.