; (xi) 1,3-butadiene; (xii) ethanol; and (xiii) polycyclic aromatic hydrocarbons, including at a minimum benzo(a)pyrene; (D) measure the tendency of measured emissions to form secondary organic aerosols and any other relevant secondary air pollution; and (E) consult with the Secretary of Energy, the Secretary of Agriculture, and the Secretary of Transportation (or their delegates). (b) Certification by Secretary of Energy The Administrator shall— (1) provide the proposed design of the study under subsection (a) to the Secretary of Energy for review; and (2) not commence the study under subsection (a) until the Secretary of Energy certifies in writing that the design of the study complies with the requirements of subsection (a). 10. Dual-fueled automobile default utilization factor (a) In general Section 32905 of title 49, United States Code, is amended by striking subsection (b) and inserting the following: (b) Dual-Fueled automobiles (1) Fuel economy Except as provided in subsection (d) or section 32904(a)(2)— (A) for any model of dual-fueled automobile manufactured by a manufacturer in model years 1993 through 2020, the Administrator of the Environmental Protection Agency shall measure the fuel economy for that model by dividing 1.0 by the sum of— (i) 0.5 divided by the fuel economy measured under section 32904(c) when operating the model on gasoline or diesel fuel; and (ii) 0.5 divided by the fuel economy— (I) measured under subsection (a) when operating the model on alternative fuel; or (II) measured based on the fuel content of B20 when operating the model on B20, which is deemed to contain 0.15 gallon of fuel; and (B) subject to paragraph (3), for any model of dual-fueled automobile manufactured by a manufacturer in model year 2023 or later, the Administrator of the Environmental Protection Agency shall measure the fuel economy for that model by dividing 1.0 by the sum of— (i) 0.79 divided by the fuel economy measured under section 32904(c) when operating the model on gasoline or diesel fuel