1. Short title; table of contents (a) Short title This Act may be cited as the 21st Century Transportation Fuels Act . (b) Table of contents The table of contents for this Act is as follows: Sec. 1. Short title; table of contents. Title I—High-Octane Fuel Sec. 101. High efficiency vehicles. Sec. 102. Octane disclosure. Sec. 103. 98 RON certification test fuel. Sec. 104. Octane sensitivity study. Sec. 105. Advertisement of price of 95 RON automotive fuel. Title II—Renewable fuels Subtitle A—Renewable fuel program Sec. 201. Updates and revisions to regulations. Sec. 202. Waivers. Sec. 203. Applicability. Sec. 204. State ethanol laws. Subtitle B—Ethanol waivers Sec. 211. Reid vapor pressure. Sec. 212. E20. Subtitle C—Fueling infrastructure Sec. 221. Performance standards for new E20 infrastructure. Title III—Vehicle Fuel Efficiency Sec. 301. Credits for exceeding average fuel economy standards. Sec. 302. Calculation of average fuel economy. Sec. 303. Rule of construction. I High-Octane Fuel 101. High efficiency vehicles (a) Requirements Part A of title II of the Clean Air Act ( 42 U.S.C. 7521 et seq.) is amended by adding at the end the following new section: 220. Octane specification (a) Applicability This section applies with respect to any motor vehicle (other than a motorcycle) that is introduced into commerce that— (1) is a light-duty vehicle or light-duty truck; (2) is a model year 2023 or later motor vehicle; and (3) uses gasoline for propulsion or any other operation of the motor vehicle, including the engine thereof. (b) Warranty requirements The manufacturer of a motor vehicle described in subsection (a) shall warrant to the ultimate purchaser and each subsequent purchaser that each such motor vehicle is designed— (1) to operate with gasoline containing up to and including 20 percent ethanol