a more stringent phasedown schedule within 365 days of granting the petition. (E) Required showing Any petition under subparagraph (A) shall include a showing by the petitioner that there are adequate data to support the petition. (F) Insufficient information If the Administrator determines that data are not adequate to grant or deny the petition, the Administrator shall use any authority available to the Administrator, under any applicable law, to acquire such data. (3) Limitation The Administrator may not promulgate a more stringent phasedown schedule under this subsection applicable to any calendar year prior to calendar year 2024. (e) Essential uses (1) Petition