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40 C.F.R. § 86.1860-17

How to comply with the Tier 3 fleet-average standards.

§ 86.1860-17 How to comply with the Tier 3 fleet-average standards.

(a) You must show that you meet the applicable fleet-average NMOG + NOX standards from §§ 86.1811 and 86.1816 and the fleet-average evaporative emission standards from § 86.1813 as described in this section. Note that separate fleet-average calculations are required for the FTP and SFTP exhaust emission standards under § 86.1811.

(b) Calculate your fleet-average value for each model year for all vehicle models subject to a separate fleet-average standard using the following equation, rounded to the nearest 0.001 g/mile for NMOG + NOX emissions and the nearest 0.001 g/test for evaporative emissions:

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Where:

i = A counter associated with each separate Tier 3 test group or evaporative family. b = The number of separate Tier 3 test groups or evaporative families from a given averaging set to which you certify your vehicles. Ni = The actual nationwide sales for the model year for test group or evaporative family i. Include allowances for evaporative emissions as described in § 86.1813. FELi = The FEL selected for test group or evaporative family i. Disregard any separate standards that apply for in-use testing or for testing under high-altitude conditions. Ntotal = The actual nationwide sales for the model year for all your Tier 3 vehicles from the averaging set, except as described in paragraph (c) of this section. The pool of vehicle models included in Ntotal may vary by model year, and it may be different for evaporative standards, FTP exhaust standards, and SFTP exhaust standards in a given model year.
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