President Donald Trump on Wednesday announced a proposal to weaken vehicle mileage rules for the auto industry, loosening regulatory pressure on automakers to control pollution from gasoline-powered cars and trucks.

The plan, if finalized next year, would significantly reduce fuel economy requirements, which set rules on how far new vehicles need to travel on a gallon of gasoline, through the 2031 model year. The administration and automakers say the rules will increase Americans’ access to the full range of gasoline vehicles they need and can afford.

The National Highway Traffic Safety Administration projects that the new standards would set the industry fleetwide average for light-duty vehicles at roughly 34.5 miles per gallon in the 2031 model year, down from a projected 50.4 miles pe

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