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Federal Register / Vol. 86, No. 169 / Friday, September 3, 2021 / Proposed Rules
paragraph b and the appropriate values in Table 2 to this paragraph b.

Figure 1 to Paragraph b Required_Fuel_Economy_Level
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:

1

1 1 1

a+
Where:

b-

ex-cd
a 1 + ex-cd
Parameters a, b, c, and d are defined in Table 2 of this paragraph b;
e = 2.718; and
x = footprint in square feet, rounded to the nearest tenth of the vehicle model.

Table 2 to Paragraph b-Parameters for the Passenger Automobile Fuel Economy Targets Parameters Model year
a mpg
b mpg
c gal/mi/ft2

d gal/mi
2011

31.20

24.00

51.41

1.91

c For model years 20122026, a manufacturers passenger automobile fleet shall comply with the fleet average
fuel economy level calculated for that model year according to Figure 2 to this
paragraph c and the appropriate values in Table 3 to this paragraph c.

Figure 2 to Paragraph c
Li PRODUCT/ONi
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; and 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 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.

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PRODUCTIONTARGET,l i
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Li
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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 groups designation, i.e., i = 1, 2, 3, etc., represents automobiles that share a unique model type and footprint within
=

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