The new rule cuts the year-over-year improvements expected from the auto industry, slashing standards that require automakers to produce fleets that average nearly 55 mpg by 2025. Instead, the Trump rule would bring that number down to about 40 mpg by 2026, bringing mileage below what automakers have said is possible for them to achieve.
The Trump administration has argued that cutting Corporate Average Fuel Economy (CAFE) standards will allow automakers to produce cheaper cars, something they say will save 3,300 lives as lower prices spur consumers to upgrade to new vehicles with better safety features that guzzle less gas than older models.