Standard No.:	GB 27999-2025
English Name:	Fuel consumption evaluation methods and targets for passenger cars
Chinese Name:	乘用车燃料消耗量评价方法及指标
Chinese Classification:	T40    Automobiles in general
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-06-30
Implemented on:	2026-1-1
Status:	to be valid
Superseding:	GB 27999-2019 Fuel consumption evaluation methods and targets for passenger cars
Target Language:	English
File Format:	PDF
Word Count:	7000 words
Translation Price(USD):	210.0
Delivery:	via email in 1 business day

GB 27999-2025 Fuel consumption evaluation methods and targets for passenger cars English Fuel consumption evaluation methods and targets for passenger cars 1 Scope This document specifies the requirements of corporate average fuel consumption indicators and production consistency of passenger cars, and describes the corresponding evaluation methods. This document is applicable to M1 vehicles, including gasoline, diesel, dual-fuel and dual-fuel vehicles, hybrid vehicles, pure electric vehicles, fuel cell vehicles, vehicles fueled with natural gas, vehicles fueled with liquefied petroleum gas and vehicles fueled with methanol. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 18386.1-2021 Test methods for energy consumption and range of electric vehicles - Part 1:Light-duty vehicles GB/T 19233-2020 Measurement methods of fuel consumption for light-duty vehicles GB/T 19596 Terminology of electric vehicles GB/T 19753-2021 Test methods for energy consumption of light-duty hybrid electric vehicles GB/T 29125 Test methods for fuel consumption of CNG vehicles GB/T 37340-2019 Conversion methods for energy consumption of electric vehicles GB/T 38146.1 China automotive test cycle - Part 1 : Light-duty vehicles GB/T 43252-2023 Test methods of energy consumption and range for fuel cell electric vehicles QC/T 1130-2021 Measurement methods of fuel consumption for methanol vehicles 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 19596 and GB/T 38146.1 as well as the following apply. 3.1 fuel consumption of vehicle type combined fuel consumption of a certain vehicle type determined according to the prescribed method 3.2 average fuel consumption average fuel consumption of a vehicle fleet calculated by weighting the number of vehicles corresponding to the vehicle type 3.3 corporate average fuel consumption; CAFC average fuel consumption of fuel consumption of passenger cars produced or imported by a corporate in a year, which is weighted with the production or import volume of the year 3.4 corporate average fuel consumption of traditional passenger cars CAFCtp average fuel consumption of fuel consumption of traditional passenger cars produced or imported by a corporate in a year, which is weighted with the production or import volume of the year Note: Traditional passenger cars refer to vehicles that can use gasoline, diesel, gas fuel or alcohol ether fuel, excluding externally rechargeable hybrid vehicles. 3.5 corporate average fuel consumption target TCAFC average fuel consumption of the fuel consumption target of passenger cars produced or imported by a corporate in a year, which is weighted with the production or import volume of the year 3.6 corporate average fuel consumption target of traditional passenger cars TCAFCtp average fuel consumption of the fuel consumption target of traditional passenger cars produced or imported by a corporate in a year, weighted with the production or import volume of the year 3.7 off-cycle technology; OCT technology that has obvious energy saving effect in actual use, which, however, cannot (completely) be measured by existing test methods 3.8 off-cycle device; OCD device that has obvious energy saving effect in actual use, which, however, cannot (completely) be measured by existing test methods 3.9 corporate average CO2 emission average CO2 emission of CO2 emission of passenger cars produced or imported by a corporate in a year, which is weighted with the production or import volume of the year 4 Determination of the reference fuel consumption, target and CO2 emission of vehicle type 4.1 Determination of fuel consumption of vehicle type 4.1.1 For gasoline, diesel, bi-fuel and dual-fuel passenger cars, the type certification value of fuel consumption of vehicle type shall be determined using the Worldwide Harmonized Light Vehicle Test Cycle (WLTC) according to GB/T 19233-2020. 4.1.2 For non-external rechargeable hybrid passenger cars, the type certification value of vehicle fuel consumption shall be determined by WLTC according to GB/T 19753-2021. For external rechargeable hybrid passenger cars, the type certification value of OVC-HEV fuel and power consumption shall be determined by WLTC according to GB/T 19753-2021, and the converted fuel consumption of OVC-HEV shall be calculated according to G.3 (converted by simple conversion method) in GB/T 19753-2021.

Contents Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Determination of reference fuel consumptions, targets and CO2 emissions of vehicle types 5 Calculation method and targets of corporate average fuel consumption 6 Conformity of Productions