Fuel consumption in NEDC
Since the start of the nineties, the introduction of the standard European exhaust emissions regulations has meant that vehicle emissions in the EU are measured on the basis of a standard driving cycle (the New European Driving Cycle, or NEDC for short). The NEDC was developed by the EU Commission and the UN Economic Commission for Europe (UNECE) to provide consumers and politicians in Europe with a standard scale. The NEDC therefore provides a basis for verifying compliance with emission limits within current emissions legislation and also for finding the official consumption values and the CO2 emissions of a vehicle. The NEDC applies to all cars and light commercial vehicles. The electric range of plug-in hybrids and electric cars is also calculated on the basis of the NEDC.
The NEDC describes the actual driving profile but also the measuring and ambient conditions for a measurement. For example, in NEDC it is stated very precisely how a vehicle must be loaded for the CO2 measurement and at what temperatures the measurement must be taken. Objective comparisons of various NEDC measurements is only possible if these standards definitions of ambient measurement conditions are observed.
In real traffic, of course, vehicles will not match to these consumption figures calculated with NEDC. The reasons for this are wide-ranging-drivers have possibly the greatest influence on the figures through their driving style. The range of possible conditions and driving profiles can only be reflected to a limited extent by a standard test cycle such as the NEDC.
The VDA has published a brochure on the subject of fuel consumption in conjunction with the VDIK and TÜV Nord. This explains how fuel consumption and emissions measurements work in the European Union and how fuel consumption in reality may differ from the certified consumption figures based on the NEDC. The brochure is entitled “Facts and arguments about fuel consumption” and is available to download at www.vda.de/de/publikationen/publikationen_downloads/.