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§ 1037.231 Powertrain families.
(a) If you choose to perform powertrain testing as specified in § 1037.550, use good engineering judgment to divide your product line into powertrain families that are expected to have similar fuel consumptions and CO2 emission characteristics throughout the useful life. Your powertrain family is limited to a single model year.
(b) Except as specified in paragraph (c) of this section, group powertrains in the same powertrain family if they share all the following attributes:
(1) Engine family as specified in 40 CFR 1036.230.
(2) Shared vehicle service class grouping, as follows: