(1) The President shall prescribe regulations that require passenger automobiles leased for at least 60 consecutive days or bought by executive agencies in a fiscal year to achieve a fleet average fuel economy (determined under paragraph (2) of this subsection) for that year of at least the greater of
(A) 18 miles a gallon; or
(B) the applicable average fuel economy standard under section
32902 (b) or (c) of this title for the model year that includes January 1 of that fiscal year.
(2) Fleet average fuel economy is
(A) the total number of passenger automobiles leased for at least 60 consecutive days or bought by executive agencies in a fiscal year (except automobiles designed for combat-related missions, law enforcement work, or emergency rescue work); divided by
(B) the sum of the fractions obtained by dividing the number of automobiles of each model leased or bought by the fuel economy of that model.
