[Code of Federal Regulations]
[Title 49, Volume 5]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR537.9]

[Page 105]
 
                        TITLE 49--TRANSPORTATION
 
                            OF TRANSPORTATION
 
PART 537--AUTOMOTIVE FUEL ECONOMY REPORTS--Table of Contents
 
Sec. 537.9  Determination of fuel economy values and average fuel economy.

    (a) Vehicle configuration fuel economy values. (1) For each vehicle 
configuration for which a fuel economy value is required under paragraph 
(c) of this section and has been determined and approved under 40 CFR 
part 600, the manufacturer shall submit that fuel economy value.
    (2) For each vehicle configuration specified in paragraph (a)(1) of 
this section for which a fuel economy value approved under 40 CFR part 
600, does not exist, but for which a fuel economy value determined under 
that part exists, the manufacturer shall submit that fuel economy value.
    (3) For each vehicle configuration specified in paragraph (a)(1) of 
this section for which a fuel economy value has been neither determined 
nor approved under 40 CFR part 600, the manufacturer shall submit a fuel 
economy value based on tests or analyses comparable to those prescribed 
or permitted under 40 CFR part 600 and a description of the test 
procedures or analytical methods used.
    (b) Base level and model type fuel economy values. For each base 
level and model type, the manufacturer shall submit a fuel economy value 
based on the values submitted under paragraph (a) of this section and 
calculated in the same manner as base level and model type fuel economy 
values are calculated for use under subpart F of 40 CFR part 600.
    (c) Average fuel economy. Average fuel economy must be based upon 
fuel economy values calculated under paragraph (b) of this section for 
each model type and must be calculated in accordance with 40 CFR 
600.506, using the configurations specified in 40 CFR 600.506(a)(2), 
except that fuel economy values for running changes and for new base 
levels are required only for those changes made or base levels added 
before the average fuel economy is required to be submitted under this 
part.