in consultation with the Administrator of General Services, where appropriate, may permit a Federal fleet to acquire a smaller percentage than is required in such paragraph, so long as the aggregate percentage acquired by all Federal fleets is at least equal to the required percentage. (4) Definitions In this subsection: (A) Federal fleet The term Federal fleet means 20 or more light duty motor vehicles, medium duty passenger vehicles, or heavy duty motor vehicles, located in a metropolitan statistical area or consolidated metropolitan statistical area, as established by the Bureau of the Census, with a 1980 population of more than 250,000, that are centrally fueled or capable of being centrally fueled and are owned, operated, leased, or otherwise controlled by or assigned to any Federal executive department, military department, Government corporation, independent establishment, or executive agency, the United States Postal Service, the Congress, the courts of the United States, or the Executive Office of the President. Such term does not include— (i) motor vehicles held for lease or rental to the general public