Where:

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

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

Ti 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 II;

e = 2.718; and

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

Where:

CAFErequired 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;

Productioni 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;

TARGETi 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 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 III; and

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