WLTP Meaning: What It Is, and Why Chinese EV Range Figures Look So Different

If you’ve browsed more than a couple of pages on this site, you’ll have noticed something odd: the same kind of car sometimes gets quoted with two very different range figures, a big number for models still sold only in China, and a noticeably smaller one for anything actually on sale in the UK. That’s not inconsistency on our part, it comes down entirely to which test the range figure is measured under. Here’s what WLTP actually means, and why it matters.

WLTP meaning: what the letters stand for

WLTP stands for Worldwide Harmonised Light Vehicles Test Procedure. It’s the official test used across the UK and Europe to measure a car’s fuel consumption, emissions, and, for electric vehicles specifically, range. It replaced an older, considerably more optimistic test called NEDC (New European Driving Cycle), for new car types from September 2017 and for all new registrations from September 2018.

Despite the name, WLTP’s main goal isn’t strictly “maximum realism”, it’s global harmonisation, a single standardised method so that different cars can be fairly compared against each other. That said, it’s still a genuine improvement over NEDC: it’s a longer test, run across a wider range of speeds (up to around 81mph), and it accounts for things like the car’s actual weight, aerodynamics, and even optional extras that add drag or consumption, none of which NEDC properly captured.

Why CLTC figures always look so much higher

Many of the models covered on this site haven’t launched in the UK yet, and are quoted using CLTC (China Light-Duty Vehicle Test Cycle) instead, China’s own equivalent standard. CLTC is structured very differently: it weights heavily toward slow, stop-and-go city driving, with a much lower top speed than WLTP, conditions that happen to be exactly where an electric motor is at its most efficient. Lower speeds mean less aerodynamic drag, and more stop-start driving gives regenerative braking more chances to recover energy. The result is that CLTC consistently produces the most optimistic range figure of any major global standard.

As a rough rule of thumb, CLTC figures typically run about 20 to 25% higher than the equivalent WLTP figure for the exact same car, same battery, same motor, just a different test. A useful way to estimate: divide the CLTC number by roughly 1.2 to 1.25 to get a realistic sense of what that model’s WLTP figure would likely be if and when it reaches the UK.

Even WLTP isn’t quite real-world

Worth being honest about too: WLTP is a lab test, run on a chassis dynamometer (the car sits on rollers indoors, it doesn’t actually drive anywhere), so even the UK’s own official figures tend to overstate what you’ll see day to day, particularly on the motorway or in cold weather, both of which are harder on any EV’s efficiency than the test cycle accounts for. A car quoted at 400km WLTP might realistically manage 320 to 360km in normal mixed driving, dropping further still, to perhaps 240 to 280km, on a motorway run in freezing conditions.

None of this makes WLTP figures useless, they remain the fairest like-for-like way to compare different cars against each other, which is exactly why we quote them consistently for every UK-available model on this site. Just treat any single number, WLTP or CLTC, as a ceiling rather than a guarantee.

See our full model directory for range figures, clearly marked WLTP or CLTC depending on where each model is currently sold.