From NPR.

The Trump administration is proposing to “reset” fuel economy standards for new cars, paving the way for automakers to sell larger numbers of less efficient gas-powered vehicles, a move environmental groups say will create more greenhouse gas emissions.

The Biden administration had set ambitious targets for new vehicles’ gas mileage. Under President Trump, the federal government had already zeroed out the penalty for flunking those standards, making them toothless. The new change is expected to boost automakers’ bottom line. Trump says it will also benefit drivers’ budgets, although economic analyses have found that stringent standards actually save households money by requiring less gas.