; (D) for model years 2019 through 2021, 4.0 miles per gallon; and (E) for model year 2022 and subsequent model years, 6.0 miles per gallon. ; and (B) in paragraph (5), by striking 2010 and inserting 2009 . 3. Calculation of average fuel economy Section 32904(a) of title 49, United States Code, is amended by adding at the end the following: (3) For model years 2012 through 2025, if requested by a manufacturer, the average fuel economy calculated by the Administrator for the manufacturer’s passenger and nonpassenger automobiles shall include off-cycle technology fuel economy credits equivalent to the credits calculated by the Administrator for the off-cycle technology under the Administrator’s vehicle emissions standards for the same or closest model year, provided that the technology has a direct impact upon improving fuel economy performance. . 4. Rule of construction Nothing in this Act or the amendments made by this Act may be construed to direct or grant new authority to the Secretary of Transportation to modify a maximum feasible average fuel economy standard established under section 32902 of title 49, United States Code. The Secretary’s authority to establish and amend a maximum feasible average fuel economy standard as provided in such section is unaffected by this Act and the amendments made by this Act.