Emission credits = (Std - FEL) * (CF) * (UL) * (Production) * (10-6)
Emission credits = (Std - FEL) * (CF) * (UL) * (Production) * (10-6) * (Discount)
Std = the current and applicable heavy-duty engine NOX plus NMHC or particulate emission standard in grams per brake horsepower hour or grams per Megajoule.
FEL = the NOX plus NMHC, or particulate family emission limit for the engine family in grams per brake horsepower hour or grams per Megajoule.
CF = a transient cycle conversion factor in BHP-hr/mi or MJ/mi, as given in paragraph (c)(2) of this section.
UL = the useful life described in § 86.004-2 , or alternative life as described in § 86.004-21(f) , for the given engine family in miles.
Production = the number of engines produced for U.S. sales within the given engine family during the model year. Quarterly production projections are used for initial certification. Actual production is used for end-of-year compliance determination.
Discount = a one-time discount applied to all credits to be banked or traded within the model year generated. Except as otherwise allowed in paragraphs (k) and (l) of this section, the discount applied here is 0.9. Banked credits traded in a subsequent model year will not be subject to an additional discount. Banked credits used in a subsequent model year's averaging program will not have the discount restored.
40 C.F.R. §86.004-15