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Text with EEA relevance.
Regulation (EU) 2018/858 of the European Parliament and of the Council of 30 May 2018 on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles, amending Regulations (EC) No 715/2007 and (EC) No 595/2009 and repealing Directive 2007/46/EC (Text with EEA relevance.) · European Union

the formula to be used for the assessment of CO2 emissions shall be as follows: Where: CO2 is the combined mass of CO2 emissions in g/km, ‘m’ is the mass of the vehicle in running order in kg and ‘p’ the maximum engine power output in kW. Combined mass of CO2 shall be calculated with one decimal place, then rounded to the nearest whole number as follows: | Petrol engine and manual gearbox: CO2 = 0,047 m + 0,561 p + 56,621 | Petrol engine and automatic gearbox CO2 = 0,102 m + 0,328 p + 9,481 | Petrol engine and hybrid electric: CO2 = 0,116 m – 57,147 | Diesel engine and manual gearbox: CO2 = 0,108 m – 11,371 | Diesel engine and automatic gearbox: CO2 = 0,116 m – 6,432 if the figure following the decimal point is below 5, the total is rounded down; if the figure following the decimal point is equal to 5 or above 5, the total is rounded up;

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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.