*   *   *   *   *

(c) *  *  *

(2) *  *  *

(vi) For natural gas dual fuel model types, for model years 1993 through 2016, and optionally for 2021 and later model years, the harmonic average of the following two terms; the result rounded to the nearest 0.1 mpg:

*   *   *   *   *

(vii) This paragraph (c)(2)(vii) applies to model year 2017 through 2020 natural gas dual fuel model types. Model year 2021 and later natural gas dual fuel model types may use the provisions of paragraph (c)(2)(vi) of this section or this paragraph (c)(2)(vii).

*   *   *   *   *

(B) Model year 2017 through 2020 natural gas dual fuel model types must meet the following criteria to qualify for use of a Utility Factor greater than 0.5:

*   *   *   *   *

(j) *  *  *

(2) *  *  *

(v) For natural gas dual fuel model types, for model years 2012 through 2015, and optionally for 2021 and later model years, the arithmetic average of the following two terms; the result rounded to the nearest gram per mile:

*   *   *   *   *

(vii)

(A) This paragraph (j)(2)(vii) applies to model year 2016 through 2020 natural gas dual fuel model types. Model year 2021 and later natural gas dual fuel model types may use the provisions of paragraph (j)(2)(v) of this section or this paragraph (j)(2)(vii).

*   *   *   *   *

(B) Model year 2016 through 2020 natural gas dual fuel model types must meet the following criteria to qualify for use of a Utility Factor greater than 0.5:

*   *   *   *   *

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