WLTP refers to a global standard regulatory test for measuring the range capability of a light duty vehicle. It is designed to be a robust real-world measurement of a vehicle's emissions (air pollutants and CO2) and energy consumption.
It stands for Worldwide Harmonised Light Vehicle Test Procedure. WLTP became mandatory for all new cars from September 2018.
WLTP replaces the older New European Driving Cycle (NEDC) standard test.
See also: https://electrictogether.com/get-help/how-far-can-a-typical-ev-travel-on-a-single-charge