WLTP (Worldwide harmonised Light vehicle Test Procedure) is the new process that has been phased in from 2017, which measures fuel, energy consumption, range and emissions and replaces the previous NEDC (New European Driving Cycle) driving cycle to measure fuel consumption and emissions in passenger vehicles in Europe. This is designed to provide figures closer to real-world driving behaviour. It tests vehicles with optional equipment and with a more demanding test procedure and driving profile. Differences in figures between the two testing regimes are due to a change in how the vehicles are tested, rather than a reduction in performance.