; and (B) technically and economically feasible. (3) EPA determination of nationwide availability (A) Determination required Not later than December 31, 2031, and not later than each December 31 thereafter until the Administrator determines that 98 research octane number gasoline can be made readily available nationwide, the Administrator shall— (i) determine whether 98 research octane number gasoline can be made readily available nationwide; and (ii) publish that determination in the Federal Register. (B) Effect The requirements of this subsection shall not take effect until the date on which the Administrator— (i) determines under subparagraph (A)(i) that 98 research octane number gasoline can be made readily available nationwide