On March 31, 2020, the U.S. Environmental Protection Agency (“EPA”) and the National Highway Traffic Safety Administration (“NHTSA” and, collectively, the “Agencies”) released the pre-publication version of the final part to their joint Safer Affordable Fuel-Efficient (“SAFE”) Vehicles Rule. The new rule amends EPA’s greenhouse gas emission standards for passenger vehicles, light-duty trucks, and medium-duty passenger vehicles in model years 2021 and onward, and it simultaneously amends or creates NHTSA’s corporate average fuel economy standards for similar vehicles in model years (MY) 2021-2026. Under these harmonized regulations, each new model year will bring a 1.5% increase in stringency through MY 2026. Though a significant lessening of requirements from joint standards last set in 2012, this “steady ramp rate” is a notable change from the proposed version of the SAFE Vehicles Rule, which sought to maintain requirements as they applied in MY 2020. The new rule will take effect sixty days from its publication in the Federal Register.