The WLTP Standard and Its Limits
Since September 2018, all new cars sold in the European Union — including Poland — must carry range figures measured under the Worldwide Harmonised Light Vehicle Test Procedure (WLTP). This replaced the older, widely-criticised NEDC standard, which produced figures that were even further from reality.
WLTP is conducted in a laboratory at a controlled temperature of 23 °C, with a defined mix of urban and extra-urban driving at speeds up to 131.3 km/h. Optional equipment that adds aerodynamic drag or weight — roof racks, for example — is fitted during the test, which made WLTP more representative than its predecessor. But laboratory conditions still differ from a winter motorway run or stop-start city traffic in Warsaw.
WLTP range figures are the legal minimum standard for EU market advertising. They are not guarantees of real-world performance.
How Much Range Is Lost in Practice?
Independent testing by organisations including Spritmonitor and the Norwegian EV Association consistently shows real-world range running 10–25% below WLTP under mild conditions, and 30–40% below in cold weather. For a car rated at 400 km WLTP, that translates to roughly 280–340 km in summer and 240–280 km in January.
| Condition | Estimated WLTP Retention | Example: 400 km WLTP |
|---|---|---|
| Summer, 20–25 °C, mixed | 85–92% | 340–368 km |
| Autumn/Spring, 10–15 °C | 75–85% | 300–340 km |
| Winter, 0 to −10 °C | 60–72% | 240–288 km |
| Motorway, 130 km/h, summer | 70–78% | 280–312 km |
| City only, 20 °C | 95–110% | 380–440 km |
City driving actually benefits EVs because of regenerative braking. In heavy urban traffic, an efficient EV can match or slightly exceed its WLTP figure. Motorway speeds and cold temperatures are the two factors that reduce range most sharply.
Temperature Effects on Lithium-Ion Cells
Polish winters regularly bring temperatures between −5 °C and −15 °C in eastern regions. Lithium-ion chemistry reacts poorly to cold for two distinct reasons.
First, the electrochemical reactions inside the cell slow down, reducing the power available from the battery. Second, cabin heating in an EV draws directly from the traction battery — there is no waste heat from a combustion engine to repurpose. A 5 kW heater running for 30 minutes consumes 2.5 kWh, equivalent to roughly 15–18 km of range on a mid-sized EV.
Most modern EVs include a heat pump rather than a resistive heater. Heat pumps extract thermal energy from the outside air and deliver three to four times as much heat per kilowatt consumed. Cars like the Hyundai IONIQ 5, Volkswagen ID.4, and Tesla Model Y with heat pump lose significantly less range in winter than older models using resistive elements alone.
Battery Capacity: Usable vs. Total
Manufacturers do not allow the full battery capacity to be used. A car advertised with a 77 kWh battery typically has a usable capacity of 73–74 kWh. The remaining 3–5% is held in reserve at the top and bottom of the charge window to protect cell longevity. This is normal practice across the industry and is already accounted for in WLTP figures.
| Model | Total Capacity | Usable Capacity | WLTP Range |
|---|---|---|---|
| Tesla Model Y Long Range AWD | 82 kWh | 75 kWh | 533 km |
| Volkswagen ID.4 Pro | 82 kWh | 77 kWh | 529 km |
| Hyundai IONIQ 6 Standard Range | 53 kWh | 52 kWh | 429 km |
| Renault Megane E-Tech EV60 | 60 kWh | 55 kWh | 470 km |
Battery Degradation Over Time
Lithium-ion batteries lose a small amount of capacity with each charge cycle. This is well-documented and unavoidable, but the rate varies considerably by chemistry, thermal management quality, and charging habits.
Data collected from Tesla vehicles by analyst Maarten Steinbuch showed that the average Model S lost roughly 5% capacity in the first 80,000 km and then slowed its degradation markedly, reaching around 90% retention at 300,000 km. Newer battery chemistries, including LFP (lithium iron phosphate) used in some BYD and Tesla Standard Range models, degrade even more slowly and tolerate frequent fast charging better than NMC cells.
In Poland, the majority of EV charging is done at home overnight at low power (7–11 kW), which is the gentlest possible charge profile and extends cell life. Frequent use of ultra-rapid DC chargers above 150 kW does accelerate degradation slightly, though manufacturers have improved thermal management to minimise this in 2024–2026 model year vehicles.
Practical Advice for Polish Drivers
- Pre-condition the cabin while still connected to the charger in winter. Heating the interior before departure uses grid power rather than battery reserves, preserving range.
- Set the charge limit to 80% for daily use. Charging to 100% regularly accelerates degradation. Only charge fully before a long trip.
- Use Eco mode on motorways. Limiting speed to 110–120 km/h rather than 130 km/h increases range by 15–20% at motorway speeds.
- Plan charging stops with a buffer. Arriving at a DC charger with 10–15% remaining is preferable to arriving near 0%, which stresses the cells.
- Check real-world data. Sites like Spritmonitor and ev-database.org publish verified consumption figures submitted by owners.
