WLTP, CLTC or EPA? A guide to how far an electric car really goes, on Romanian roads and anywhere else
The same Tesla Model Y is rated at 750 km in China, 600 km in Europe and 526 km in the US. Here's what each test cycle measures, why CLTC is the most optimistic and EPA the most conservative, and how much real range to expect in town, on national roads, on the motorway and in winter.
Try a simple exercise. Take one car, a Tesla Model Y Long Range all-wheel drive, and look up its official range in three markets:
- 750 km in China (CLTC cycle)
- 600 km in Europe (WLTP cycle)
- 526 km in the US (EPA cycle)
It's the same body with a similar-sized battery, yet the highest and lowest figures are more than 220 km apart. The car doesn't change from country to country. The test does.
If you follow news about Chinese EVs, Tesla or any new electric car, you'll run into these three acronyms all the time. Below: what each one means, how to compare them and, most importantly, how far you can expect to go on real roads, with Romania as our example.
The short version: three cycles
| CLTC (China) | WLTP (Europe) | EPA (US) | |
|---|---|---|---|
| Used in | China | EU, UK, Japan and other markets | US |
| Length of one cycle | 30 minutes | 30 minutes | City and highway cycles, repeated until the battery is empty |
| Distance of one cycle | 14.5 km | 23.3 km | 12.1 km (city) / 16.5 km (highway) |
| Average speed | 29 km/h | 46.5 km/h | 31.5 km/h (city) / 77.7 km/h (highway) |
| Top speed | 114 km/h | 131 km/h | 91 km/h (city) / 96 km/h (highway) |
| Time spent stopped | about 22% | about 13% | — |
| Real-world correction | no | no | yes, results are usually multiplied by 0.7 |
| How optimistic | most optimistic | in between | most conservative |
Cycle data: DieselNet, US EPA.
CLTC: range for a Shanghai traffic jam
CLTC (China Light-duty Vehicle Test Cycle) is the cycle China uses to certify consumption and range. It mimics congested Chinese city traffic: in 30 minutes the car covers just 14.5 km, averages 29 km/h and stands still nearly a quarter of the time. Top speed barely passes 114 km/h, and only for a few moments.
For an EV, that's ideal. At low speed, air resistance hardly matters, and every time the car brakes some energy is recovered. That's why CLTC figures are the highest in the world. When you read that a Chinese car has "800 km of range", it's almost certainly CLTC.
A recent example: the Tesla Model Y L just got 776 km CLTC in China. The Model Y L sold in the US, whose specs may differ in the details, is EPA-rated at 328 miles, or 528 km. That's a gap of almost 250 km.
WLTP: the number you see at European dealers
WLTP (Worldwide harmonised Light vehicles Test Procedure) has been used in the EU since 2017–2019. It replaced the old NEDC, which was even more optimistic. The cycle has four phases: low, medium, high and extra-high. It also lasts 30 minutes but covers 23.3 km, averaging 46.5 km/h with a top speed of 131 km/h. The car is stationary only about 13% of the time.
It's more realistic than CLTC, but it has limits too. The test runs in a lab at about 23°C with climate control off. And the "extra-high" phase averages only 92 km/h, well below a 130 km/h motorway cruise.
A useful detail: WLTP doesn't just give one combined number. Every car also has consumption figures per phase. For the Model Y Premium AWD, ADAC lists manufacturer data of 15.9 kWh/100 km combined but 19.2 kWh/100 km in the motorway phase. If you can find these figures, the motorway phase tells you more about long trips than the combined average.
EPA: the Americans knock off 30% up front
The US Environmental Protection Agency (EPA) tests differently. The car starts with a full battery and repeats the city cycle until it stops. Then it's recharged and repeats the highway cycle until it's empty again.
The key part comes after the test. The lab distances are adjusted for real-world conditions: air conditioning, cold weather, high speeds and aggressive driving. The EPA says the most common method is simple: multiply the results by 0.7, a 30% cut. Manufacturers can also use alternative methods with extra tests, which may give a different factor. Finally, city and highway range are combined 55% / 45%.
Because of that correction, EPA usually gives the lowest number and, in general, the one closest to what you'll see in real life.
The full example: Tesla Model Y Long Range AWD
| Cycle | Official range | Vs. WLTP | Source |
|---|---|---|---|
| CLTC (China) | 750 km | +25% | Tesla China |
| WLTP (Europe, 19" wheels) | 600 km | baseline | ADAC, manufacturer data |
| EPA (US, combined) | 526 km (327 mi) | −12% | fueleconomy.gov |
| EPA, city only | 555 km (345 mi) | −8% | fueleconomy.gov |
| EPA, highway only | 491 km (305 mi) | −18% | fueleconomy.gov |
In Europe this version is now called Model Y Premium AWD. The three cars aren't identical down to the bolt: battery supplier, wheels, model year or motor details may differ. They are, however, the equivalent versions in each market.
How to "translate" one figure into another
There's no exact formula. InsideEVs compared several models sold in all three markets and found that the gaps vary widely by carmaker, sometimes even between models from the same brand. As a rule of thumb, InsideEVs puts WLTP at roughly 22% above EPA and CLTC at roughly 35% above EPA.
Combined with the official figures for the Model Y and Model Y L, that gives a quick first estimate:
| You have… | To estimate… | Multiply by roughly |
|---|---|---|
| CLTC | WLTP | 0.8 – 0.9 |
| CLTC | EPA | 0.7 |
| WLTP | EPA | 0.8 – 0.9 |
Examples: for the Model Y, 750 km CLTC × 0.8 = 600 km WLTP, exactly the official figure. For the previous Model Y L, the ratio was closer to 0.9: 751 km CLTC vs. 681 km WLTP in Australia, according to EVSHIFT. So treat these factors as a range, not a fixed rule.
How far you really go (Romania as an example)
Three things matter most: speed, temperature and terrain. Air resistance grows with the square of speed, so the difference between 110 and 130 km/h hits the battery hard. Cold slows battery chemistry and uses energy for heating, although a heat pump helps a lot.
Romanian speed limits make a good real-world reference: 50 km/h in towns, 90–100 km/h on national roads (DN), 130 km/h on motorways. Here's what to expect relative to the WLTP figure, again using a Model Y Premium AWD with 600 km WLTP:
| Scenario | Share of WLTP | Model Y AWD (600 km WLTP) | Based on |
|---|---|---|---|
| City, summer (50 km/h, frequent stops) | 95–110% | 570–660 km | WLTP low-speed phase consumption is below the combined average (ADAC) |
| National road, summer (80–90 km/h) | 85–100% | 510–600 km | Cupra Raval test below, ADAC tests |
| Motorway at 110–115 km/h, summer | ~80% | ~480 km | Out of Spec measured 298 miles (480 km) at 113 km/h |
| Motorway at 130 km/h, summer | 65–75% | 390–450 km | Our estimate |
| Winter, mixed driving (−5…+5°C) | 70–95% | 420–570 km | NAF: losses of 4% to 29% vs. WLTP |
| Winter, motorway at 130 km/h | 55–65% | 330–390 km | Our estimate |
The first three rows and the winter mixed row are backed by published measurements. The 130 km/h rows are rough estimates, and real results vary from model to model.
Some reference points from real tests:
- ADAC, Germany's largest motoring club, measured 438 km for the Model Y Standard in its own cycle, which includes motorway driving up to 130 km/h. The official WLTP figure is 534 km, so that's about 82% of WLTP.
- In the January 2025 El Prix winter test by Norway's motoring club NAF and Motor magazine, 24 EVs were driven at temperatures between −6 and +5°C. They lost between 4% and 29% vs. WLTP. Only eight stayed within 15% of the official figure.
- On a mountain route in north-eastern Romania, on national and county roads, the Cupra Raval Endurance did 434 km on a single charge, essentially what WLTP promises (413–446 km). The tester, however, estimates only about 250 km at 130 km/h on the motorway.
A practical tip for long trips: on the motorway you rarely use the battery from 100% to 0%. You usually leave full, then charge between roughly 10% and 80%, where charging is fastest. Between stops you therefore use about 70% of the battery. For a Model Y at 130 km/h in summer, that means roughly 270–310 km between charges.
What it means for drivers
- Always check which cycle sits next to the number. 700 km CLTC is not 700 km WLTP. In ads and on Chinese websites, it's almost always CLTC.
- To compare cars sold in Europe, use WLTP. Every EV sold officially in the EU has a WLTP figure. The comparison is fair if you look at the same wheel size.
- For a realistic figure, start from EPA. When one exists, it's the closest reference to what you'll see on the dash in normal driving.
- For motorway trips, plan on about 65–75% of WLTP in summer and 55–65% in winter. On national roads at 80–90 km/h you can get close to the official figure.
- Before you buy, compare real-world range reported by owners, not just the spec sheet. EVMobile.ro has a map of real range vs. WLTP, plus range guides.
