Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations — 27
.4 3 Class 8 Mid-roof with day cab 55.6 52.8 50.8 4 Class 8 Mid-roof with sleeper cab 49.6 46.9 44.7 5 Class 8 High-roof with day cab 54.5 51.4 48.6 6 Class 8 High-roof with sleeper cab 47.1 44.2 41.0 Alternative standards — heavy-haul tractors (1.2) For the 2021 model year and subsequent model years, a company may elect to have one or more of its heavy-haul tractors and incomplete tractors that are to become heavy-haul tractors conform, for the duration of their useful life, to a CO 2 emission rate that does not exceed the following CO 2 emission standard instead of having them conform to the applicable standard set out in paragraph (1.1)(c): (a) for the 2021 to 2023 model years, 52.4 grams of CO 2 per short ton-mile; (b) for the 2024 to 2026 model years, 50.2 grams of CO 2 per short ton-mile; and (c) for the 2027 model year and subsequent model years, 48.3 grams of CO 2 per short ton-mile. Modelling CO 2 emissions to demonstrate compliance (2) The CO 2 emission rate must be determined in accordance with sections 501 and 520 of Title 40, chapter I, subchapter U, part 1037, subpart F, of the CFR, (a) using the version of the GEM computer simulation model applicable for the model year in question; and (b) in the case of tractors and incomplete tractors of the 2021 model year or a subsequent model year that are plug-in hybrid vehicles or fuel cell vehicles powered by any fuel other than hydrogen, taking into account the powertrain testing procedure set out in section 550 of Title 40, chapter I, subchapter U, part 1037, subpart F, of the CFR. Reference in CFR — interpretation (3) For the purposes of subsection (2), a reference in the CFR to “regulatory subcategory” is to be read as a reference to the fleet referred to in one of subparagraphs 18(3)(a)(ix) to (xvi) that includes the same type of tractors and incomplete tractors as those to which the simulation model is being applied but, in the case of tractors and incomplete tractors of the 2021 model year or a subsequent model year that have a GCWR of 43 998 kg (97,000 pounds) or more, but less than 54 431 kg (120,000 pounds), is to be read as a reference to the fleet referred to in subparagraph 18(3)(a)(xiii). Electric vehicles or fuel cell vehicles powered by hydrogen (4) For the purposes of this section and sections 34 to 47, the CO 2 emission rate of tractors and incomplete tractors of the 2021 model year or a subsequent model year that are electric vehicles or fuel cell vehicles powered by hydrogen is zero grams of CO 2 per short ton-mile. Weight reduction technologies (5) For greater certainty, CO 2 emission credits for weight reduction technologies other than those that are referred to in section 520(e) of Title 40, chapter I, subchapter U, part 1037, subpart F, of the CFR may be obtained under section 41. Alternative method for measuring drag area (6) Instead of the coastdown method referred to in section 525 of Title 40, chapter I, subchapter U, part 1037, subpart F, of the CFR, a company may elect to measure the tractor’s drag area (C d A ) in accordance with any other method referred to in that section if the test results are adjusted to correlate with test results that would be obtained if the coastdown method were used, as specified in that section, and if (a) in the case of a tractor that is covered by an EPA certificate, the election has been approved by the EPA for that tractor and the company provides the Minister with evidence of the EPA approval; and (b) in the case of a tractor that is not covered by an EPA certificate, the company provides the Minister with evidence demonstrating that the alternative method for measuring the tractor’s drag area referred to in this subsection is more representative of that tractor’s drag area. Election to conform to standards for heavier tractors (7) For any given tractor or incomplete tractor referred to in subsection (1) or (1.1) that is or is to become a Class 7 tractor, a company may elect to have it conform to the emissio