Electric car range has become one of the biggest numbers in the car buying process. It is often the figure shouted loudest in the advert, highlighted in the brochure and repeated across social media.
“Up to 350 miles.”
“Over 400 miles of range.”
“Long-distance electric driving made easy.”
It all sounds brilliant. And to be fair, modern electric cars have come a very long way. Many EVs now offer enough range for everyday life, long commutes and proper motorway journeys. But there is one very important thing every buyer needs to understand.
The official range figure is not a promise. It is a comparison tool.
That difference matters.
I have spent a lot of time driving, reviewing and testing electric cars in the real world, and this is where many people get caught out. They see a headline range figure, assume that is what they will get every day, then feel disappointed when the car behaves differently on a cold, wet motorway run in January.
The car is not necessarily faulty. The manufacturer has not always lied. But the number on the brochure needs context.
So, how do you read electric car range claims properly? And more importantly, how do you work out what an EV will actually do in normal British driving?
What Does WLTP Range Actually Mean?
In the UK and Europe, official electric car range figures are usually quoted using WLTP, which stands for Worldwide Harmonised Light Vehicle Test Procedure.
WLTP replaced the older NEDC test, which was widely criticised for producing figures that were too optimistic. The UK Vehicle Certification Agency says WLTP is now used to establish official fuel and energy consumption, CO2 emissions and electric range for new cars.
That is a good thing. WLTP is far better than the old system. It gives buyers a more consistent way to compare one car with another.
But it is still a laboratory test.
WLTP is designed to create a controlled, repeatable environment. It is not designed to perfectly replicate your commute, your motorway habits, your local hills, your winter school run, your roof box, your heated seats or the fact that British roads seem to be wet for half the year.
Research organisation TNO explains that WLTP testing is carried out under controlled conditions, including 23 degrees Celsius, no weather impact and a fully charged, temperature-conditioned battery. It also makes clear that the test is useful for comparing vehicles, but not necessarily a perfect guide to real-world range.
That is the key point. WLTP is useful. It just should not be treated as a guaranteed driving range.
Why the Official Range Is Usually Higher Than Real Life
The problem with electric car range is that it is affected by far more variables than many people realise.
With a petrol or diesel car, most drivers understand that mpg changes depending on how and where they drive. A diesel SUV might show 55mpg on paper, but you would not expect that if you spent every journey doing short, cold trips through town.
EVs are the same, but the difference can feel more obvious because range is displayed so clearly on the dashboard.
A car with a 350-mile WLTP range might be capable of doing close to that in gentle summer driving. It might even exceed it in slow urban use. But it may be nowhere near 350 miles if you are sitting at 70mph on the motorway in cold, wet weather with the heating on.
That does not mean the WLTP figure is useless. It means you need to read it correctly.
Think of WLTP as the “best standardised comparison figure”, not the “exact number you will see every day”.
The Motorway Penalty: Why EV Range Drops at Speed
One of the biggest mistakes people make is assuming that electric cars behave like petrol and diesel cars at speed.
Many combustion cars are at their most efficient on a steady run once they are warm, especially compared with stop-start urban driving. Electric cars are different.
EVs are often extremely efficient around town because they can recover energy through regenerative braking. Every time you lift off or slow down, some energy can be put back into the battery. That is why many electric cars show their best efficiency in urban and suburban driving.
Motorways are different.
At higher speeds, an EV has to fight aerodynamic drag. As speed rises, air resistance increases heavily, and the energy needed to push the car through the air rises quickly. Car and Driver’s speed testing found that EV range dropped sharply as cruising speed increased, with a Kia EV9 losing 109 miles of estimated range between 55mph and 75mph in its test.
That is why a car that feels brilliant around town can suddenly look thirsty on a long motorway run.
As a rough guide, a 300-mile WLTP EV might deliver something like:
- Gentle urban driving in mild weather 300 to 330 miles
- Mixed driving in normal conditions 230 to 260 miles
- Motorway driving in mild weather 210 to 240 miles
- Motorway driving in winter 180 to 220 miles
Those are not exact numbers, because every car is different. A sleek saloon will usually cope better at speed than a tall, boxy SUV. But the pattern is consistent.
Speed matters. Shape matters. Weather matters.
Winter Range: Why November Feels Different To July
Winter is where many new EV drivers get their first surprise.
Battery performance is affected by temperature. When it is cold, the chemical processes inside the battery are less efficient. The car may also use energy to warm the battery, heat the cabin and keep the windows clear.
Hyundai, for example, notes that electric driving range is affected by battery size, driving style, outside temperature, comfort settings, passenger numbers and cargo weight.
This is why the same EV can feel like two different cars depending on the season.
In summer, you might see strong efficiency, especially if you are driving gently. In winter, the range can fall noticeably. Add motorway speeds, rain, wind, heating and heavier traffic, and the gap becomes even bigger.
This is not unique to one brand. It affects every electric car, although some manage it better than others.
The best EVs for winter use tend to have good thermal management, efficient heating systems and often a heat pump. A heat pump can reduce the amount of battery energy needed to warm the cabin, although the exact benefit depends on the car and conditions.
The Big Wheel Tax
Large alloy wheels look great. I get it. A top-spec EV on 20, 21 or 22-inch wheels can look far more desirable than the entry-level version on smaller alloys.
But when it comes to range, big wheels are rarely your friend.
Larger wheels are often heavier, less aerodynamic and fitted with lower-profile tyres. They can increase rolling resistance and reduce ride comfort, which is not ideal on British roads.
This is not just theory. Kia’s UK data for the EV3 shows how specification can affect range. The EV3 Long Range Air on 17-inch wheels is listed at 375 miles combined WLTP, while the Long Range GT-Line S on 19-inch wheels is listed at 362 miles. Same battery size, different specification, lower range.
That does not mean you should never choose bigger wheels. Styling matters. Trim level matters. Some people will happily trade a little range for the look they want.
But if range is genuinely important to you, pay attention to the wheel size and not just the battery size.
A smaller wheel on an EV can often mean:
- Better efficiency
- Better ride comfort
- Lower tyre replacement costs
- Less risk of pothole damage
- More usable real-world range
That is not as exciting as a glossy set of huge alloys, but it is often the smarter choice.
Battery Size Is Not the Whole Story
A bigger battery usually means more range, but it is not always the best answer.
Large batteries add weight. They cost more. They can make the car less efficient. They can also increase the monthly lease or finance cost quite significantly.
This is why efficiency matters just as much as battery size.
A car with a smaller battery but excellent efficiency can be better to live with than a heavy EV with a huge battery that uses more energy per mile. This is especially true if most of your driving is local and you can charge at home.
When comparing EVs, look at:
- Battery size in kWh
- Official WLTP range
- Real-world range estimates
- Efficiency in miles per kWh
- Charging speed
- Charging curve
- Heat pump availability
- Wheel size
- Vehicle shape and weight
The best EV is not always the one with the biggest number. It is the one that fits your actual driving.
Why Charging Speed Can Matter More Than Range
This is where I think a lot of buyers focus on the wrong figure.
Range is important, of course. But for long journeys, charging speed can be even more important.
Imagine two electric cars:
- Car A has a 400-mile range but charges slowly.
- Car B has a 280-mile range but can add energy very quickly at an ultra-rapid charger.
On paper, Car A looks better. In real life, Car B might be easier on a long journey because the charging stops are shorter and better suited to how people actually travel.
This is why you should look beyond the headline range figure and check the 10 to 80% rapid charging time.
Most manufacturers quote 10 to 80% because that is the useful rapid charging window. Charging usually slows down heavily above 80% to protect the battery and manage heat. GRIDSERVE explains that charging power is linked to battery state of charge, and that the charging curve usually drops sharply around 80%.
That means charging from 10 to 80% might take 20 to 35 minutes in a good modern EV, but going from 80 to 100% can feel painfully slow.
For long trips, it is usually better to stop briefly, charge to around 80%, then continue.
Do Not Be Fooled By Peak Charging Speed
This is another area where the brochure can be misleading.
You might see a car advertised with “up to 250kW charging”. That sounds fantastic. But the phrase “up to” is doing a lot of work.
Peak charging speed is the highest rate the car can accept in ideal conditions. It does not mean the car will charge at that speed for the whole session.
Some EVs hit a high peak briefly, then drop quickly. Others have a lower peak but hold a strong rate for longer. In day-to-day use, the second car can sometimes be better.
What matters is the charging curve.
A charging curve shows how quickly the car charges across the full session. It is affected by battery temperature, state of charge, charger output and the car’s battery management system.
So, when comparing EVs, do not just ask: “What is the peak charging speed?”
Ask:
- How long does it take to charge from 10 to 80%?
- Can it precondition the battery before rapid charging?
- Does it hold a strong charging rate?
- Does it need a 350kW charger to achieve its best time?
- How common are suitable chargers on your usual routes?
Hyundai says the IONIQ 5’s 800V battery system helps enable faster charging than many 400V EVs, especially when using a 350kW charger, but also notes that actual charge time depends on factors including battery temperature, battery condition, ambient temperature and charger power.
That small print is important. The car, the charger and the conditions all have to work together.
Ben’s Real-World EV Range Rule
When I am looking at an electric car, I use a simple rule. Take the official WLTP range and subtract 25%. That gives you a sensible real-world mixed-driving estimate. If you do a lot of winter motorway driving, subtract 40%. That gives you a safer worst-case figure.
For example:
Official WLTP range / Mixed real-world estimate / Winter motorway estimate
- 250 miles / Around 185 miles / Around 150 miles
- 300 miles / Around 225 miles / Around 180 miles
- 350 miles / Around 260 miles / Around 210 miles
- 400 miles / Around 300 miles / Around 240 miles
This is not scientific down to the mile, but it is a useful buying tool. If the car still works for your longest regular journey using the winter motorway estimate, you are probably going to be fine. If it only just works using the WLTP figure, be careful.
The Questions I Would Ask Before Buying An EV
Before choosing an electric car, I would ask myself these questions:
1. What is my longest regular journey?
Do not buy based on the one imaginary road trip you might do once a year. Buy around your real life. If your longest regular journey is 120 miles, you do not necessarily need a 400-mile EV.
2. Can I charge at home?
Home charging changes everything. If you can start most days with a full battery, range anxiety becomes far less of an issue.
3. How often do I drive long distances?
If long motorway trips are rare, charging speed may matter less. If you cover serious business mileage, it matters a lot.
4. Do I drive mostly on motorways?
Motorway drivers should be more cautious with range claims. A car that looks efficient around town may be much less impressive at 70mph.
5. Does the car have a heat pump?
A heat pump is not essential, but it can help winter efficiency, especially if you regularly drive longer distances in cold weather.
6. What wheel size does the car have?
Do not assume every version of the same EV has the same range. Trim level, wheels and options can all make a difference.
7. What is the 10 to 80% charging time?
This is more useful than just looking at the peak kW figure.
8. Can the car precondition its battery?
Battery preconditioning warms or cools the battery before rapid charging, helping the car charge more quickly when you arrive at a suitable charger.
What EV Range Figure Should You Actually Trust?
Trust the WLTP figure as a comparison. Do not trust it as a guarantee. If one car has a WLTP range of 380 miles and another has 280 miles, the 380-mile car will almost certainly go further in like-for-like conditions. That is where WLTP is useful.
But do not assume either car will achieve its official figure every day.
The better approach is to use three numbers:
- Official WLTP range
- Expected real-world mixed range
- Expected winter motorway range
That gives you a much clearer picture.
For example, a car with a 350-mile WLTP range might become:
- 350 miles official
- 260 miles mixed real-world
- 210 miles winter motorway
Suddenly, you are not being fooled by the headline figure. You are making a proper buying decision.
Why This Matters More For Used EV Buyers
This is not just a new car issue. Used EV buyers need to be even more careful.
A used electric car might have:
- Older battery technology
- Slower charging speeds
- No heat pump
- Less efficient tyres
- Reduced battery health
- Outdated route planning
- A less accurate range estimator
That does not mean used EVs are a bad idea. Far from it. Many are excellent value.
But you need to understand what you are buying. A used EV with a 250-mile official range from several years ago may not behave like a new EV with the same figure today. Check the usable battery size, charging speed, battery warranty and real-world owner feedback before committing.
Final Verdict: Range Claims Are Not Lies, But They Need Translation
Electric car range figures are not useless. They are not fake. They are not something to ignore.
But they do need translating.
WLTP gives us a fairer way to compare cars, but real life is messier than a laboratory. British weather, motorway speeds, wheel size, heating, driving style and charging behaviour all make a difference.
My advice is simple. Do not buy the biggest range number you can afford. Buy the EV that fits your life. Look for strong efficiency, sensible wheels, good charging performance, a heat pump if winter driving matters to you, and a realistic range buffer for your regular journeys.
Once you understand how to read the numbers properly, electric car ownership becomes much easier to enjoy.
Because despite all the confusion around range claims, a good EV is still one of the most relaxing, refined and satisfying ways to travel.
You just need to know what the brochure is really telling you.