This Regulation applies to vehicles of categories M1 and N1 1 with regard to: (a) The measurement of the emission of carbon dioxide (CO2) and fuel consumption and/or to the measurement of electric energy consumption and electric range of vehicles powered by an internal combustion engine only or by a hybrid electric power train, (b) And to the measurement of electric energy consumption and electric range of vehicles powered by an electric power train only. It does not apply to a category N1 vehicle if both: (a) The engine type fitted to that type of vehicle has received type approval pursuant to Regulation No. 49, and (b) The total annual worldwide production of N1 vehicles of the manufacturer is less than 2,000 units.