§ 600.210-12 Calculation of fuel economy and CO2 emission values for labeling.

(a) General labels. Except as specified in paragraphs (d) and (e) of this section, fuel economy and CO₂ emissions for general labels may be determined by one of two methods. The first is based on vehicle-specific model-type 5-cycle data as determined in § 600.209-12(b). This method is available for all vehicles and is required for vehicles that do not qualify for the second method as described in § 600.115 (other than electric vehicles). The second method, the derived 5-cycle method, determines fuel economy and CO₂ emissions values from the FTP and HFET tests using equations that are derived from vehicle-specific 5-cycle model type data, as determined in paragraph (a)(2) of this section. Manufacturers may voluntarily lower fuel economy (MPG) values and raise CO₂ values if they determine that the label values from any method are not representative of the in-use fuel economy and CO₂ emissions for that model type, but only if the manufacturer changes both the MPG values and the CO₂ value and revises any other affected label value accordingly for a model type (including but not limited to the fuel economy 1-10 rating, greenhouse gas 1-10 rating, annual fuel cost, 5-year fuel cost information). Similarly, for any electric vehicles and plug-in hybrid electric vehicles, manufacturers may voluntarily lower the fuel economy (MPGe) and raise the energy consumption (kW-hr/100 mile) values if they determine that the label values are not representative of the in-use fuel economy, energy consumption, and CO₂ emissions for that model type, but only if the manufacturer changes both the MPGe and the energy consumption value and revises any other affected label value accordingly for a model type. Manufacturers may voluntarily lower the value for electric driving range if they determine that the label values are not representative of the in-use electric driving range.

(1) Vehicle-specific 5-cycle labels. The city and highway model type fuel economy determined in § 600.209-12(b), rounded to the nearest mpg, and the city and highway model type CO₂ emissions determined in § 600.209-12(b), rounded to the nearest gram per mile, comprise the fuel economy and CO₂ emission values for general fuel economy labels, or, alternatively;

(2) Derived 5-cycle labels. Derived 5-cycle city and highway label values are determined according to the following method:

(i)

(A) For each model type, determine the derived five-cycle city fuel economy using the following equation and coefficients determined by the Administrator:

(B) For each model type, determine the derived five-cycle city CO₂ emissions using the following equation and coefficients determined by the Administrator:

Derived 5-cycle City CO₂ = City Intercept · A + City Slope · MT FTP CO₂

(ii)

(A) For each model type, determine the derived five-cycle highway fuel economy using the equation below and coefficients determined by the Administrator:

(B) For each model type, determine the derived five-cycle highway CO₂ emissions using the equation below and coefficients determined by the Administrator:

Derived 5-cycle Highway CO2 = Highway Intercept · A + Highway Slope · MT HFET CO2