; manufacturer The terms motor vehicle and manufacturer have the meaning given such terms under paragraphs (2) and (3) of section 30D(d), respectively. (4) Specified natural gas The term specified natural gas means compressed natural gas, liquefied natural gas, and renewable natural gas. (e) Limitation on number of new qualified natural gas motor vehicles eligible for credit (1) In general In the case of a new qualified natural gas motor vehicle sold during the phaseout period with respect to such vehicle, only the applicable percentage of the credit otherwise allowable under subsection (a) shall be allowed. (2) Phaseout period For purposes of this subsection, the phaseout period is— (A) in the case of a new qualified natural gas motor vehicle described in subsection (b)(1)(A), the period beginning with the second calendar quarter following the calendar quarter which includes the first date on which the number of new qualified natural gas motor vehicles described in subsection (b)(1)(A), manufactured by the manufacturer of such vehicle, and sold for use in the United States after December 31, 2018, is at least 200,000, and (B) in the case of a new qualified natural gas motor vehicle described in subparagraph (B) or (C) of subsection (b)(1), the period beginning with the second calendar quarter following the calendar quarter which includes the first date on which the combined number of new qualified natural gas motor vehicles described in subparagraph (B) or (C) of subsection (b)(1), manufactured by the manufacturer of such vehicle, and sold for use in the United States after December 31, 2018, is at least 100,000. (3) Applicable percentage For purposes of paragraph (1), the applicable percentage is— (A) 50 percent for the first 2 calendar quarters of the phaseout period, (B) 25 percent for the 3d and 4th calendar quarters of the phaseout period, and (C) 0 percent for each calendar quarter thereafter. (4) Controlled groups Rules similar to the rules of section 30B(f)(4) shall apply for purposes of this subsection.