Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations — 41
, subchapter U, part 1037, subpart B, of the CFR, for the fleet or subfleet, as the case may be, D is the payload for the class of vocational vehicles and incomplete vocational vehicles, which is (I) 2.85 short tons for vocational vehicles that are light heavy-duty vehicles and incomplete vocational vehicles that are to become light heavy-duty vehicles, (II) 5.6 short tons for vocational vehicles that are medium heavy-duty vehicles and incomplete vocational vehicles that are to become medium heavy-duty vehicles, and (III) 7.5 short tons for vocational vehicles that are heavy heavy-duty vehicles and incomplete vocational vehicles that are to become heavy heavy-duty vehicles, E is the number of vocational vehicles and incomplete vocational vehicles manufactured with the innovative technology in question in the fleet or subfleet, as the case may be, and F is the useful life of the vehicles of the fleet or subfleet, as the case may be, expressed in miles, or (B) for tractors and incomplete tractors: [A – (B × C)] × D × E × F 1 000 000 where A is the CO 2 emission standard under subsection 27(1), (1.1) or (1.2) that applies to the tractors and incomplete tractors of the fleet or subfleet, as the case may be, expressed in grams of CO 2 per short ton-mile, B is the CO 2 family emission limit for the fleet or subfleet, as the case may be, expressed in grams of CO 2 per short ton-mile, C is the improvement factor calculated in accordance with sections 610(b)(1) and (c) of Title 40, chapter I, subchapter U, part 1037, subpart G, of the CFR, for the fleet or subfleet, as the case may be, of tractors and incomplete tractors or, in the case of tractors and incomplete tractors of the 2018 to 2020 model years, is the applicable improvement factor set out in section 150(y)(2)(i) of Title 40, chapter I, subchapter U, part 1037, subpart B, of the CFR, for the fleet or subfleet, as the case may be, D is the payload for the class of tractors, which is (I) 12.5 short tons for Class 7 tractors or incomplete tractors, (II) 19 short tons for Class 8 tractors and incomplete tractors of the 2020 model year or an earlier model year and for Class 8 tractors and incomplete tractors of the 2021 model year or a subsequent model year that have a GCWR of less than 54 431 kg (120,000 pounds), and (III) 43 short tons for Class 8 tractors and incomplete tractors of the 2021 model year or a subsequent model year that have a GCWR of 54 431 kg (120,000 pounds) or more, E is the number of tractors and incomplete tractors manufactured with the innovative technology in question in the fleet or subfleet, as the case may be, and F is the useful life of the tractors or incomplete tractors of the fleet or subfleet, as the case may be, expressed in miles; or (c) in the case of heavy-duty engines, (i) by using the following formula for engines tested on a chassis: (A – B) × C × D × E 1 000 000 where (A – B) is the difference between the in-use emission rate of the engine manufactured without the innovative technology and the in-use emission rate of the engine manufactured with the innovative technology, determined in accordance with chassis A to B testing or in-use A to B testing of pairs of vehicles equipped with the engines differing only with respect to the innovative technology in question, and expressed in grams of CO 2 per short ton-mile, C is the number of vocational vehicles, incomplete vocational vehicles, tractors or incomplete tractors with engines manufactured with the innovative technology in the fleet, D is the payload, if applicable, for the class of vehicles, which is (A) 2.85 short tons for vocational vehicles that are light heavy-duty vehicles and incomplete vocational vehicles that are to become light heavy-duty vehicles, (B) 5.6 short tons for vocational vehicles that are medium heavy-duty vehicles and incomplete vocational vehicles that are to become medium heavy-duty vehicles, (C) 7.5 short tons for vocational vehicles that are heavy heavy-duty vehicle