[Code of Federal Regulations] [Title 40, Volume 27] [Revised as ofJuly 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR600.509-86] [Page 908] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 600--FUEL ECONOMY OF MOTOR VEHICLES--Table of Contents Subpart F--Fuel Economy Regulations for Model Year 1978 Passenger Sec. 600.509-86 Voluntary submission of additional data. (a) The manufacturer may, at his option, submit data in addition to the data required by the Administrator. (b) Additional fuel economy data may be submitted by the manufacturer for any vehicle configuration which is to be tested as required in Sec. 600.507 or for which fuel economy data were previously submitted under paragraph (c) of this section. (c) Within a base level, additional fuel economy data may be submitted by manufacturing for any vehicle configuration which is not required to be tested by Sec. 600.507. [49 FR 13854, Apr. 6, 1984]