§ 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:
(2) Terms used in the equations in this paragraph (a) are defined as follows:
(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:
(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) Fuel economy calculations for hybrid electric vehicles. Test hybrid electric vehicles as described in SAE J1711 (incorporated by reference in § 600.011). For FTP testing, this generally involves emission sampling over four phases (bags) of the UDDS (cold-start, transient, warm-start, transient); however, these four phases may be combined into two phases (phases 1 + 2 and phases 3 + 4). Calculations for these sampling methods follow: