WLTP
Worldwide Harmonized Light Vehicles Test Procedure
The lab test used for official new-car fuel consumption, CO2, and electric range figures in Europe and the UK. Comparable between cars, but not a promise for real driving.
WLTP is the laboratory test procedure behind the official fuel consumption, CO2, and electric range figures for new cars in the EU and the UK. Cars run a standardized speed profile on a dynamometer, so WLTP numbers are comparable between models, which is what they are for.
They are not a promise of what you will get. The test runs in a laboratory through four speed phases, low, medium, high, and extra-high, and cannot copy every real trip. Fuel use and EV range in daily driving vary with speed, temperature, load, and driving style, so treat the WLTP range as a comparison tool and the difference between two cars as the reliable part.
The UK Vehicle Certification Agency says WLTP replaced the older NEDC cycle for official new-car figures in September 2017 and became mandatory for all new cars powered by an internal combustion engine by September 2018. On CarPairly, range and consumption always name their cycle: WLTP or EPA.
Differs by market
The same car can carry different official figures by market: WLTP in the EU and UK, EPA in the US. Never compare a WLTP range directly against an EPA range.