The bill amends the Clean Air Act to allow year-round sale of E15 ethanol blends and adjusts Renewable Fuel Standard requirements for small refining companies, including defining them and reducing compliance requirements. The bill also permits credits for small refineries, prohibits obligated volume reallocation, and requires the EPA to finalize a rule regarding fuel infrastructure and dispenser labeling requirements. It introduces an exemption for at-risk qualifying small refineries, allowing them to petition for compliance exemptions, under specific conditions. The bill aims to facilitate the sale and distribution of ethanol blends, alter compliance obligations for small refineries, and address potential closure risks for qualifying small refineries.