The range figure on any used EV listing comes from a laboratory test. Here is what that means for you in practice and how to calculate a realistic figure before committing to a purchase.
Why the gap exists
The WLTP test is conducted under controlled conditions — fixed temperature, no wind, a specific speed pattern, no accessories running. Real driving is none of those things. Speed varies. Weather changes. Heating and air conditioning draw power. Passengers and luggage add weight.
The result is a consistent gap between what is advertised and what drivers achieve.
Realistic adjustments for UK driving
- Normal mixed driving in mild weather — expect around 75 to 85% of WLTP.
- Motorway driving at 65 to 70mph — expect around 65 to 75% of WLTP.
- Cold weather below 5°C — expect 60 to 70% of WLTP.
- Cold motorway combined — as low as 55 to 65% of WLTP.
The used EV adjustment
On top of real-world conditions, a used battery holds less energy than it did when new. A vehicle with 88% battery state of health has an effective range roughly 12% lower than the WLTP figure before any driving condition adjustments.
Always check battery state of health separately from the advertised range. The listing figure reflects a new battery. The vehicle you are looking at is not new.
A practical calculation
Take the WLTP figure, multiply by the battery state of health as a percentage, then multiply by 0.80 for a realistic mixed-driving estimate. The result gives you a working range figure to assess whether the vehicle suits your regular journeys.
