[Code of Federal Regulations]
[Title 10, Volume 3]
[Revised as of January 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR474.3]

[Page 512]
 
                            TITLE 10--ENERGY
 
                    CHAPTER II--DEPARTMENT OF ENERGY
 
PART 474_ELECTRIC AND HYBRID VEHICLE RESEARCH, DEVELOPMENT, AND 
 
Sec. 474.3  Petroleum-equivalent fuel economy calculation.

    (a) The petroleum-equivalent fuel economy for an electric vehicle is 
calculated as follows:
    (1) Determine the electric vehicle's Urban Dynamometer Driving 
Schedule energy consumption value and the Highway Fuel Economy Driving 
Schedule energy consumption value in units of Watt-hours per mile;
    (2) Determine the combined energy consumption value by averaging the 
Urban Dynamometer Driving Schedule energy consumption value and the 
Highway Fuel Economy Driving Schedule energy consumption value using a 
weighting of 55 percent urban/45 percent highway; and
    (3) Calculate the petroleum-equivalent fuel economy by dividing the 
appropriate petroleum-equivalency factor (depending on whether any 
petroleum-powered accessories are installed; see paragraph (b) of this 
section) by the combined energy consumption value, and round to the 
nearest 0.01 miles per gallon.
    (b) The petroleum-equivalency factors for electric vehicles are as 
follows:
    (1) If the electric vehicle does not have any petroleum-powered 
accessories installed, the value of the petroleum equivalency factor is 
82,049 Watt-hours per gallon.
    (2) If the electric vehicle has any petroleum-powered accessories 
installed, the value of the petroleum-equivalency factor is 73,844 Watt-
hours per gallon.