Fuel economy testing: What is WLTP and how does it work?

WLTP fuel consumption test process (v NEDC) NEDC (old method) WLTP (new method) Cycle time 20 minutes 30 minutes Cycle distance 11 kilometres (6.83 miles) 23.25 kilometres (14.44 miles) Driving 2 phases: urban driving 66% / extra-urban driving 34%. 4 phases: urban driving 52% / extra-urban driving 48%. Average speed 34 km/h 46.5 km/h Maximum speed 120 km/h 131 km/h Influence of optional equipment The options and their impact on regulated emissions (CO, HC, NOx, Particles) and consumption expressed in CO2 are not taken into account. Options and their impact on regulated emissions (CO, HC, NOx, Particles) and consumption expressed in CO2 are taken into account. Gears (manual gearbox) Pre-determined and fixed gear shifts Gear changes determined according to vehicle characteristics Temperature testing Measurements taken at temperatures between 20° and 30°C Measurements taken at 23°C, then at 14°C for CO2 emissions