Figure 1:

Where:

N is the total number (sum) of light trucks produced by a manufacturer;

N_i is the number (sum) of the ith light truck model type produced by a manufacturer; and

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

Where:

Parameters a, b, c, and d are defined in Table V;

e = 2.718; and

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

Figure 2:

Where:

CAFE_required is the fleet average fuel economy standard for a given light truck fleet;

Subscript i is a designation of multiple groups of light trucks, where each group's designation, i.e., i = 1, 2, 3, etc., represents light trucks that share a unique model type and footprint within the applicable fleet.

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

TARGET_i is the fuel economy target in miles per gallon (mpg) applicable to the footprint of light trucks within each ith designation, i.e., which share the same model type and footprint, calculated according to either Figure 3 or Figure 4, as appropriate, 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.

Figure 3:

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 VI; and

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

Figure 4:

Where:

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

Parameters a, b, c, d, e, f, g, and h are defined in Table VII; and

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