[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: 10CFR474.5]

[Page 512-513]
 
                            TITLE 10--ENERGY
 
                    CHAPTER II--DEPARTMENT OF ENERGY
 
PART 474_ELECTRIC AND HYBRID VEHICLE RESEARCH, DEVELOPMENT, AND 
 
Sec. 474.5  Review and Update

    The Department will review Part 474 five years after the date of 
publication as a final rule to determine whether any updates and/or 
revisions are necessary. DOE will publish a notice in the Federal 
Register soliciting stakeholder input in this review. The Department 
will publish the findings of the review and any resulting adjustments to 
Part 474 in the Federal Register.

[[Page 513]]

     Appendix to Part 474--Sample Petroleum-Equivalent Fuel Economy 
                              Calculations

    Example 1: An electric vehicle is tested in accordance with 
Environmental Protection Agency procedures and is found to have an Urban 
Dynamometer Driving Schedule energy consumption value of 265 Watt-hours 
per mile and a Highway Fuel Economy Driving Schedule energy consumption 
value of 220 Watt-hours per mile. The vehicle is not equipped with any 
petroleum-powered accessories. The combined electrical energy 
consumption value is determined by averaging the Urban Dynamometer 
Driving Schedule energy consumption value and the Highway Fuel Economy 
Driving Schedule energy consumption value using weighting factors of 55 
percent urban, and 45 percent highway:

combined electrical energy consumption value = (0.55 * urban) + (0.45 * 
highway) = (0.55 * 265) + (0.45 * 220) = 244.75 Wh/mile

    Since the vehicle does not have any petroleum-powered accessories 
installed, the value of the petroleum equivalency factor is 82,049 Watt-
hours per gallon, and the petroleum-equivalent fuel economy is:

(82,049 Wh/gal) (244.75 Wh/mile) = 335.24 mpg
    Example 2: The vehicle from Example 1 is equipped with an optional 
diesel-fired cabin heater/defroster. For the purposes of this example, 
it is assumed that the electrical efficiency of the vehicle is 
unaffected.
    Since the vehicle has a petroleum-powered accessory installed, the 
value of the petroleum equivalency factor is 73,844 Watt-hours per 
gallon, and the petroleum-equivalent fuel economy is:

(73,844 Wh/gal) (244.75 Wh/mile) = 301.71 mpg