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 CO

(a)

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

(b)

(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:

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

(c)

(1)

(i)

(ii)

(2)

(i)

(ii)

(3) For hybrid electric vehicles using the modified 5-cycle highway calculation in paragraph (b)(2) of this section, the equation in paragraph (b)(2)(ii)(A) of this section applies except that the equation for Start Fuel

(i) The equation for Start Fuel

(ii) The equation for Start Fuel

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

(d)

(2) To determine the City CO

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

(e)

(2) If the condition specified in § 600.115-08(b)(2)(iii)(B) is met, in lieu of using the calculation in paragraph (e)(1) of this section, the manufacturer may optionally determine the highway carbon-related exhaust emissions 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 carbon-related exhaust emissions according to the following formula:

(3) To determine the Highway CO

(4) Terms used in the equations in this paragraph (e) are defined as follows:

(f)

(1)

(i)

(ii)

(2)

(i)

(ii)

(3) For hybrid electric vehicles using the modified 5-cycle highway calculation in paragraph (e)(2) of this section, the equation in paragraph (e)(2)(ii)(A) of this section applies except that the equation for Start CREE

(i) The equation for Start CREE

(ii) The equation for Start CREE

(4) To determine the City and Highway CO

(5) Terms used in the equations in this paragraph (e) are defined as follows: