§ 1037.670 Optional CO2 emission standards for tractors at or above 120,000 pounds GCWR.

(a) You may certify tractors at or above 120,000 pounds GCWR to the following CO₂ standards instead of the Phase 2 CO₂ standards of § 1037.106:

Table 1 of § 1037.670—Optional Phase 2 CO2 Standards for Tractors Above 120,000 Pounds GCWR

[g/ton-mile] ^a

Subcategory	Model years 2021-2023	Model years 2024-2026	Model years 2026 and later
Heavy Class 8 Low-Roof Day Cab	53.5	50.8	48.9
Heavy Class 8 Low-Roof Sleeper Cab	47.1	44.5	42.4
Heavy Class 8 Mid-Roof Day Cab	55.6	52.8	50.8
Heavy Class 8 Mid-Roof Sleeper Cab	49.6	46.9	44.7
Heavy Class 8 High-Roof Day Cab	54.5	51.4	48.6
Heavy Class 8 High-Roof Sleeper Cab	47.1	44.2	41.0

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