This legislation amends the Clean Air Act to modify regulations concerning gasoline-ethanol blends, specifically revising the Reid Vapor Pressure (RVP) requirements to extend the RVP waiver that currently applies to E10 (10% ethanol blends) to also cover gasoline-ethanol blends containing 10 to 15 percent denatured anhydrous ethanol. This change aims to facilitate the year-round sale of higher ethanol blends like E15 by ensuring they meet RVP requirements during the high ozone season, aligning them with existing E10 regulations. Furthermore, the bill addresses past compliance issues for certain small refineries under the Renewable Fuel Standard. It mandates the return of Renewable Identification Number (RIN) credits that were retired by these refineries for the 2016, 2017, and 2018 compliance years. These returned credits would then be deemed eligible for future compliance or applied to the refineries' EPA Moderated Transaction System accounts, specifically targeting those small refineries with outstanding or previously denied exemption petitions.