The U.S. Environmental Protection Agency (EPA) finalized its multipollutant rule governing tailpipe emissions standards from light duty vehicles on March 20, 2024. EPA’s modeling shows that the more stringent standards would most likely be met by 56% battery-electric vehicles by 2032. EPA completely ignored the role of bioethanol and higher bioethanol blends in the decarbonization of the light-duty fleet. Not only will EPA leave millions of tons of carbon reductions on the table through an unduly optimistic emphasis on electric vehicles (see chart), but they ignore proven home-grown solutions from America’s heartland.