GB 27999-2025Fuel consumption evaluation methods and targets for passenger cars (English PDF)

1 Scope

GB 27999-2025 is the Chinese national standard on fuel consumption evaluation methods and targets for passenger cars, in the field of road vehicles engineering. It carries no /T suffix, which in the Chinese system means compliance is mandatory: a product or a practice within its scope has to meet it to be lawfully made, sold or carried out in China. It was issued on 30 June 2025 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 January 2026. Classification: ICS 43.020, CCS T40. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This document specifies requirements for corporate average fuel consumption indicators and production consistency for passenger cars, and describes the corresponding evaluation methods. This document applies to M1 vehicles, including gasoline, diesel, bi-fuel and dual-fuel vehicles, hybrid electric vehicles, battery electric vehicles, fuel cell vehicles, natural gas fueled vehicles, liquefied petroleum gas fueled vehicles, methanol fueled vehicles, etc.

2 Normative references

The provisions of the following documents constitute the essential clauses of this document through normative references in this text. Among them, for referenced documents with dates, only the versions corresponding to the dates are applicable to this document; for referenced documents without dates, the latest versions (including all amendments) are applicable to this document.

GB/T 18386.1-2021 Test methods for energy consumption and range of electric vehicles - Part

3 Terms and definitions

The terms and definitions defined in GB/T 19596 and GB/T 38146.1 and the following apply to this document.

3.1 fuel consumption of vehicle type The comprehensive fuel consumption of a certain vehicle type determined according to the prescribed method.

3.2 average fuel consumption The average fuel consumption of a group of vehicles, which is calculated by weighing the number of vehicles corresponding to the vehicle type.

3.3 corporate average fuel consumption; CAFC The average fuel consumption that is obtained from the calculation of the fuel consumption of passenger car types produced or imported by an enterprise in a certain year, by weightings of the corresponding production or import volume in that year.

3.4 corporate average fuel consumption of traditional passenger cars CAFCtp The average fuel consumption that is obtained from the calculation of the fuel consumption of traditional energy passenger car types produced or imported by an enterprise in a certain year, by weightings of the corresponding production or import volume in that year. NOTE. Traditional energy passenger cars refer to vehicles that can be fueled by gasoline, diesel, gas fuel or alcohol ether fuel, etc., and do not include off-vehicle-chargeable hybrid electric vehicles (OVC-HEV).

3.5 corporate average fuel consumption target TCAFC The average fuel consumption that is obtained from the calculation of the fuel consumption target value of passenger car types produced or imported by an enterprise in a certain year, by weightings of the corresponding production or import volume in that year.

3.6 corporate average fuel consumption target of traditional passenger cars The average fuel consumption that is obtained from the calculation of the fuel consumption target value of traditional energy passenger car types produced or imported by an enterprise in a certain year, by weightings of the corresponding production or import volume in that year.

3.7 off-cycle technology; OCT A technology that has significant energy-saving effects in actual use but cannot be (completely) measured using existing test methods.

4 Determination of fuel consumption of vehicle type, target

values, and CO2 emission reference values

5 Calculation methods and index requirements for corporate

fuel consumption and CO2 emission

5.1 Corporate average fuel consumption (CAFC) The corporate average fuel consumption is calculated by taking the sum of the product of the fuel consumption of each vehicle type determined according to