1. Short title This Act may be cited as the State and Local Fleet Efficiency Act . 2. State and local promotion of natural gas, flexible fuel, and high-efficiency motor vehicle fleets (a) Definitions In this Act: (1) Fleet (A) In general The term fleet means a group of 20 or more light duty motor vehicles, medium duty motor vehicles, or heavy duty motor vehicles capable of carrying 14 or more passengers, operating primarily in a metropolitan statistical area or consolidated metropolitan statistical area, as established by the Bureau of the Census, with a 2000 population of more than 250,000, that are— (i) centrally dispatched; or (ii) (I) centrally fueled or capable of being centrally fueled; and (II) owned, operated, leased, or otherwise controlled by a governmental entity or other person who owns, operates, leases, or otherwise controls 50 or more such vehicles, by any person who controls such person, by any person controlled by such person, or by any person under common control with such person. (B) Excluded vehicles The term fleet does not include— (i) motor vehicles held for lease or rental to the general public; (ii) motor vehicles held for sale by motor vehicle dealers, including demonstration motor vehicles; (iii) motor vehicles used for motor vehicle manufacturer product evaluations or tests; (iv) law enforcement motor vehicles; (v) emergency motor vehicles; or (vi) motor vehicles acquired and used for military purposes that the Secretary of Defense has certified to the Secretary of Energy must be exempt for national security reasons. (2) Purchase requirement The term purchase requirement means a State or local legal requirement applying to the acquisition of fleet vehicles. Such a requirement may specify that when a fleet owner or operator acquires a new fleet vehicle, such owner or operator may acquire only new fleet vehicles that— (A) have been warranted by their manufacturer to operate on natural gas, hydrogen, or biodiesel