Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations — 26
r 2027 and Subsequent Model Years 1 Light heavy-duty vehicles 461 432 413 2 Medium heavy-duty vehicles 328 310 297 (ii) a compression-ignition engine. TABLE Column 1 Column 2 Column 3 Column 4 Item Vehicle Service Class CO 2 Emission Standard (grams of CO 2 per short ton-mile) for 2021 to 2023 Model Years CO 2 Emission Standard (grams of CO 2 per short ton-mile) for 2024 to 2026 Model Years CO 2 Emission Standard (grams of CO 2 per short ton-mile) for 2027 and Subsequent Model Years 1 Light heavy-duty vehicles 424 385 367 2 Medium heavy-duty vehicles 296 271 258 3 Heavy heavy-duty vehicles 308 283 269 Alternative standards for certain vehicles (1.2) Subject to subsection (1.3), for the 2021 model year and subsequent model years, a company may elect to have one or more of its vocational vehicles or incomplete vocational vehicles that are of a type referred to in column 1 of the table to this subsection conform, for the duration of their useful life, to the CO 2 emission standard set out in column 2 or 3 for the model year in question instead of the CO 2 emission standards set out in subsection (1.1). TABLE Column 1 Column 2 Column 3 Item Type CO 2 Emission Standard (grams of CO 2 per short ton-mile) for 2021 to 2026 Model Years CO 2 Emission Standard (grams of CO 2 per short ton-mile) for 2027 and Subsequent Model Years 1 Motor home 228 226 2 School bus 291 271 3 Coach bus 210 205 4 Other bus 300 286 5 Waste collection vehicle (see note) 313 298 6 Concrete mixer 319 316 7 Mixed-use vocational vehicle 319 316 8 Emergency vehicle 324 319 Note: For the purposes of item 5, waste collection vehicle means a vocational vehicle designed primarily to collect, compact and transport solid waste or recyclable materials. Alternative standards for certain vehicles — tires (1.3) For the 2021 model year and subsequent model years, a company may elect to have one or more of its motor homes, concrete mixers, mixed-use vocational vehicles and emergency vehicles conform to the following standards instead of the CO 2 emission standards set out in subsection (1.1) or (1.2): (a) in the case of motor homes, the vehicles must be equipped with an automatic tire inflation system or tire pressure monitoring system for each wheel that is mounted on an axle; and (b) in the case of vocational vehicles or incomplete vocational vehicles that are of a type referred to in column 1 of the table to this paragraph, the vehicles must be equipped with tires that have a tire rolling resistance level that is not more than the maximum level set out in column 2 or 3 for the model year in question. TABLE Column 1 Column 2 Column 3 Item Type Maximum Tire Rolling Resistance Level (kilograms per tonne) for 2021 to 2026 Model Years Maximum Tire Rolling Resistance Level (kilograms per tonne) for 2027 and Subsequent Model Years 1 Motor home 6.7 6.0 2 Concrete mixer 7.6 7.1 3 Mixed-use vocational vehicle 7.6 7.1 4 Emergency vehicle 8.7 8.4 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 that is applicable to the model year in question; (b) in the case of vocational vehicles and incomplete vocational vehicles of the 2021 model year or a subsequent model year, using the applicable regulatory subcategory in accordance with section 150(z) of Title 40, chapter I, subchapter U, part 1037, subpart B, of the CFR; and (c) in the case of vocational vehicles and incomplete vocational vehicles 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 (2.1) For the purposes of subsection (2), (a) a reference in