; (ii) a measure to upgrade a vehicle owned, operated, leased, or otherwise controlled by or assigned to the United States Postal Service to increase average fuel economy and reduce the emissions of carbon dioxide of such vehicle; or (iii) the construction or maintenance of infrastructure, including electric vehicle charging stations, to support vehicles described in clauses (i) and (ii). . 4. Authority to enter into utility energy service contracts Section 546 of the National Energy Conservation Policy Act ( 42 U.S.C. 8256 ) is amended in subsection (c)(1) by inserting (including measures to support the use of low emission and fuel efficient vehicles owned, operated, leased, or otherwise controlled by or assigned to the United States Postal Service and measures to support construction and maintenance of infrastructure to support such vehicles, including electric vehicle charging stations) , after demand . 5. Upgrade of Postal fleet (a) Postal fleet requirements (1) Motor vehicle standards The Postmaster General may not award a contract for a contracted vehicle, or purchase or lease a motor vehicle for use by the Postal Service, unless, at a minimum— (A) in the case of a passenger car, the car meets— (i) with respect to emissions of carbon dioxide, the more stringent of— (I) the applicable standards developed by the Environmental Protection Agency under title II of the Clean Air Act ( 42 U.S.C. 7521 et seq.); or (II) on average, less than 235 grams per mile; and (ii) with respect to average fuel economy, the more stringent of— (I) the applicable average fuel economy standards developed by the National Highway Traffic Safety Administration under chapter 329 of title 49, United States Code; or (II) 37.8 miles per gallon; (B) in the case of a light truck, the truck meets— (i) with respect to emissions of carbon dioxide, the more stringent of— (I) the applicable standards developed by the Environmental Protection Agency under title II of the Clean Air Act ( 42 U.S.C. 7521 et seq.)