[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: 40CFR600.109-08]

[Page 886]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 600_FUEL ECONOMY OF MOTOR VEHICLES--Table of Contents
 
    Subpart B_Fuel Economy Regulations for 1978 and Later Model Year 
                       Automobiles_Test Procedures
 
Sec. 600.109-08  EPA driving cycles.

    (a) The FTP driving cycle is prescribed in Sec. 86.115 of this 
chapter.
    (b) The highway fuel economy driving cycle is specified in this 
paragraph.
    (1) The Highway Fuel Economy Driving Schedule is set forth in 
Appendix I of this part. The driving schedule is defined by a smooth 
trace drawn through the specified speed versus time relationships.
    (2) The speed tolerance at any given time on the dynamometer driving 
schedule specified in Appendix I of this part, or as printed on a 
driver's aid chart approved by the Administrator, when conducted to meet 
the requirements of paragraph (b) of Sec. 600.111 is defined by upper 
and lower limits. The upper limit is 2 mph higher than the highest point 
on trace within 1 second of the given time. The lower limit is 2 mph 
lower than the lowest point on the trace within 1 second of the given 
time. Speed variations greater than the tolerances (such as may occur 
during gear changes) are acceptable provided they occur for less than 2 
seconds on any occasion. Speeds lower than those prescribed are 
acceptable provided the vehicle is operated at maximum available power 
during such occurrences.
    (3) A graphic representation of the range of acceptable speed 
tolerances is found in Sec. 86.115(c) of this chapter.
    (c) The US06 driving cycle is set forth in Appendix I of part 86 of 
this chapter.
    (d) The SC03 driving cycle is set forth in Appendix I of part 86 of 
this chapter.

[71 FR 77933, Dec. 27, 2006]