1. Short title This Act may be cited as the Flex Fuel Fairness Act of 2023 . 2. Finding Congress finds that the Greenhouse gases, Regulated Emissions, and Energy use in Technologies (GREET) model developed by Argonne National Laboratory finds that E85 fuel made with average corn starch ethanol reduces greenhouse gas emissions by 31 percent per mile traveled as compared to gasoline with no ethanol. 3. Definitions In this Act: (1) Administrator The term Administrator means the Administrator of the Environmental Protection Agency. (2) Flexible fuel vehicle The term flexible fuel vehicle has the meaning given the term in section 86.1803–01 of title 40, Code of Federal Regulations (as in effect on the date of enactment of this Act). (3) Manufacturer The term manufacturer has the meaning given the term in section 216 of the Clean Air Act ( 42 U.S.C. 7550 ). 4. Flexible fuel vehicle compliance value (a) In general Not later than 120 days after the date of enactment of this Act, the Administrator shall revise section 86.1818–12 of title 40, Code of Federal Regulations, to ensure that, for purposes of determining fleet average CO 2 standards under that section, manufacturers may use a gram per mile CO 2 value for flexible fuel vehicles that is 31 percent lower than the gram per mile CO 2 value for the same vehicle make and model that is not a flexible fuel vehicle. (b) Further adjustment The Administrator may, by regulation, apply a larger percentage reduction in the gram per mile CO 2 value for flexible fuel vehicles than the percentage described in subsection (a) if the Administrator determines that the larger percentage reduction is appropriate based on a version of the Greenhouse gases, Regulated Emissions, and Energy use in Technologies (GREET) model developed by Argonne National Laboratory after the date of enactment of this Act.