[Code of Federal Regulations]
[Title 40, Volume 29]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR610.41]

[Page 1005-1006]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 610_FUEL ECONOMY RETROFIT DEVICES--Table of Contents
 
                Subpart D_General Vehicle Test Procedures
 
Sec. 610.41  Test configurations.

    (a) In order to measure the effectiveness of a retrofit device at 
least two, and in some cases, three vehicle configurations defined in 
Sec. 610.11 will be tested. Each vehicle will be tested at least twice 
in each configuration, as determined by the Administrator.
    (b) The first test configuration is a baseline configuration. In 
this configuration the baseline or unretrofitted vehicle emissions will 
be measured.
    (c) A second test configuration, an adjusted configuration, may be 
required at the discretion of the Administrator if a device requires 
both hardware and engine parameter modifications to achieve the fuel 
economy improvement. If, in the Administrator's judgment, based on a 
review of the available information, the combined effects of retrofit 
hardware installation and parametric adjustment could be substantially 
duplicated by parametric adjustment alone, then the Administrator may 
specify a second test, to evaluate such adjustment exclusive of the 
retrofit hardware.

[[Page 1006]]

    (d) The third series of tests, in the retrofitted configuration, 
will evaluate the full retrofit system installed on the vehicle.