9. The greenhouse gas emission of a vehicle of a given model year is calculated by establishing the average greenhouse gas emission per kilometre of the vehicle (A) and by converting the result into grams of CO2 equivalent per kilometre (B) using the following formula:(1) (A): the average greenhouse gas emission per kilometre is calculated by adding 55% of the vehicle’s city emissions per kilometre to 45% of the vehicle’s highway emissions per kilometre.The city GHG emission values attributed to the vehicles of the vehicle fleet of a manufacturer are determined in accordance with the quantitative evaluation procedures of the “Federal Test Procedure (FTP)”, USA Code of Federal Regulation, 40 CFR, part 86, subpart B, and the highway emissions per kilometre are measured in accordance with the technical requirements of the “Highway Test Procedure”, USA Code of Federal Regulation, 40 CFR, part 600, subpart B.
(2) (B): the average CO2 equivalent emission value is the total of the products obtained by multiplying the greenhouse gas emissions per kilometre (A) by their respective global warming potential (GWP).
The sum of the methane (CH4) and nitrous oxide (N2O) emission values may be replaced by 1.2 grams of CO2 equivalent per kilometre.