EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Ohio on February 14, 2006, and October 6, 2006, establishing a lower Reid Vapor Pressure (RVP) fuel requirement for gasoline distributed in the Cincinnati and Dayton 8-hour ozone nonattainment areas. Ohio has developed this fuel requirement to reduce emissions of volatile organic compounds (VOC) in accordance with the requirements of the Clean Air Act (CAA). EPA is approving Ohio's fuel requirement into the Ohio SIP because EPA has found that the requirement is necessary for the Cincinnati and Dayton areas to achieve the 8-hour ozone national ambient air quality standard (NAAQS). This action is being taken under section 110 of the CAA. On March 29, 2007, the EPA published a Notice of Proposed Rulemaking (NPRM) proposing to approve the SIP revision. During the comment period EPA received a number of comments both supporting and opposing the approval of the fuel requirement. This document summarizes the comments received, EPA's responses, and finalizes the approval of Ohio's SIP revision to establish a RVP limit of 7.8 pounds per square inch (psi) for gasoline sold in the Cincinnati and Dayton 8-hour ozone nonattainment areas.