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within a variant shall group the vehicles that have the following features in common: (a) the technically permissible maximum laden mass; (b) the engine capacity in the case of internal combustion engine; (c) the maximum engine power output or the maximum continuous rated power (electric motor); (d) the nature of the fuel (petrol, gas oil, LPG, bi-fuel or other); (e) the maximum number of seating positions; (f) drive-by sound level; (g) exhaust emission level (for example Euro 5, Euro 6 or other); (h) combined or weighted, combined CO2 emissions; (i) electric energy consumption (weighted, combined); (j) combined or weighted, combined fuel consumption; As an alternative to the criteria in points (h), (i) and (j), the vehicles grouped into a version shall have in common all tests performed for the calculation of their CO2 emissions, electric energy consumption and fuel consumption in accordance with sub-Annex 6 to Annex XXI to Commission Regulation (EU) 2017/1151 (10).