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40 C.F.R. § 600.114-12

Vehicle-specific 5-cycle fuel economy and carbon-related exhaust emission calculations.

§ 600.114-12 Vehicle-specific 5-cycle fuel economy and carbon-related exhaust emission calculations.

Paragraphs (a) through (f) of this section apply to data used for fuel economy labeling under subpart D of this part. Paragraphs (d) through (f) of this section are used to calculate 5-cycle carbon-related exhaust emission values for the purpose of determining optional credits for CO2-reducing technologies under § 86.1866 of this chapter and to calculate 5-cycle CO2 values for the purpose of fuel economy labeling under subpart D of this part.

(a) City fuel economy. For each vehicle tested under § 600.010–08(a), (b), or (c), as applicable, determine the 5-cycle city fuel economy using the following equation:

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(2) Terms used in the equations in this paragraph (a) are defined as follows:

Bag Y FEX = the fuel economy in miles per gallon of fuel during bag Y of the FTP test conducted at an ambient temperature X of 75 °F or 20 °F. SC03 FE = fuel economy in mile per gallon over the SC03 test. US06 City FE = fuel economy in miles per gallon over the “city” portion of the US06 test.

(b) Highway fuel economy. (1) For each vehicle tested under § 600.010–08(a), (b), or (c), as applicable, determine the 5-cycle highway fuel economy using the following equation:

er06jy11.017.gif

(2) If the condition specified in § 600.115–08(b)(2)(iii)(B) is met, in lieu of using the calculation in paragraph (b)(1) of this section, the manufacturer may optionally determine the highway fuel economy using the following modified 5-cycle equation which utilizes data from FTP, HFET, and US06 tests, and applies mathematic adjustments for Cold FTP and SC03 conditions:

(i) Perform a US06 test in addition to the FTP and HFET tests.

(ii) Determine the 5-cycle highway fuel economy according to the following formula:

er06jy11.018.gif

(3) Terms used in the equations in this paragraph (b) are defined as follows:

Bag Y FEX = the fuel economy in miles per gallon of fuel during bag Y of the FTP test conducted at an ambient temperature X of 75 °F or 20 °F. HFET FE = fuel economy in miles per gallon over the HFET test. SC03 FE = fuel economy in mile per gallon over the SC03 test. US06 Highway FE = fuel economy in miles per gallon over the highway portion of the US06 test.
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