49 C.F.R. § 531.5 : Transportation — OTHER REGULATIONS RELATING TO TRANSPORTATION — NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION — PASSENGER AUTOMOBILE AVERAGE FUEL ECONOMY STANDARDS — Fuel economy standards

Table 1 to § 531.5 ( a )

Where:

N is the total number (sum) of passenger automobiles produced by a manufacturer;

N_i is the number (sum) of the ith passenger automobile model produced by the manufacturer; and

T_i is the fuel economy target of the ith model passenger automobile, which is determined according to the following formula, rounded to the nearest hundredth:

Where:

Parameters a, b, c, and d are defined in Table 2 to this paragraph (b);

e = 2.718; and

x = footprint (in square feet, rounded to the nearest tenth) of the vehicle model.

Table 2 to § 531.5 ( b ) - Parameters for the Passenger Automobile Fuel Economy Targets

Where:

CAFE_required is the fleet average fuel economy standard for a given fleet (domestic passenger automobiles or import passenger automobiles);

Subscript i is a designation of multiple groups of automobiles, where each group's designation, i.e., i = 1, 2, 3, etc., represents automobiles that share a unique model type and footprint within the applicable fleet, either domestic passenger automobiles or import passenger automobiles;

Production_i is the number of passenger automobiles produced for sale in the United States within each ith designation, i.e., which share the same model type and footprint; and

TARGET_i is the fuel economy target in miles per gallon (mpg) applicable to the footprint of passenger automobiles within each ith designation, i.e., which share the same model type and footprint, calculated according to Figure 3 to this paragraph (c) and rounded to the nearest hundredth of a mpg, i.e., 35.455 = 35.46 mpg, and the summations in the numerator and denominator are both performed over all models in the fleet in question.

Where:

TARGET is the fuel economy target (in mpg) applicable to vehicles of a given footprint ( FOOTPRINT , in square feet);

Parameters a, b, c, and d are defined in Table 3 to this paragraph (c); and

The MIN and MAX functions take the minimum and maximum, respectively, of the included values.

Table 3 to § 531.5 ( c )-Parameters for the Passenger Automobile Fuel Economy Targets

[MYs 2012-2026]

Table 4 to § 531.5 ( d )-Minimum Fuel Economy Standards for Domestically Manufactured Passenger Automobiles

[MYs 2011-2026]