What is the difference between NEDC and CLTC?

[MackenzieDella]

NEDC and CLTC are standards for testing the range of electric vehicles. NEDC standard: The NEDC standard is a testing protocol developed by the Ministry of Industry and Information Technology, referencing European range testing methods and standards. Its full name is New European Driving Cycle. This standard tests the range on a test bench with a city-to-suburb ratio of 4:1. During the 20-minute test, approximately 21% of the time is spent accelerating, about 15% decelerating, around 40% cruising, and roughly 25% idling. CLTC standard: The CLTC standard, whose full name is China light-duty vehicle test cycle-passenger, is specifically designed for regular passenger vehicles. The CLTC standard tests the range over a 30-minute bench test, with about 40% of the time spent accelerating, approximately 36% decelerating, around 2% cruising, and the remaining time idling.

[Theodore]

I've just studied these two testing standards, and they both measure the range of electric vehicles, but their approaches are completely different. NEDC is the old European method, simulating highway conditions with higher speeds and steady cruising. On the other hand, China's current CLTC is specifically designed for our stop-and-go commuting traffic, with frequent traffic light starts and stops, and an average speed one-third slower than NEDC. The lab testing temperatures also differ—NEDC tests at around 20°C, while CLTC uses ambient temperature. The most surreal part is that CLTC's range numbers look impressive on paper, but in real-world driving, you'll need to discount them by at least 20%, especially in winter when heating further reduces the range. So, don't get carried away by CLTC figures when buying a car—always leave enough margin.

[JulianaDella]

Everyone in our lab involved in vehicle testing knows there's a good reason why CLTC completely replaced NEDC last year. That outdated NEDC constant-speed testing method is obsolete. The new national standard CLTC adds 30% more low-speed conditions, with acceleration curves better matching stop-and-go traffic during morning rush hours. However, the practice of turning off all air conditioning and lights during testing remains unchanged, resulting in still inflated real-world range figures. Interestingly, because the test speeds are lower, CLTC data actually shows about 10% higher range than NEDC - this counterintuitive phenomenon is particularly misleading for consumers. My advice is to directly deduct 20% when looking at range figures, especially for northern users who should leave even more margin.

[MakaylaAnn]

Helping my cousin choose an electric car last time was an eye-opener. The salesperson bragged about the CLTC range of 650 km, making it sound incredible. In reality, this test deliberately avoids the power-draining black hole of traffic jams—no air conditioning or music during testing. I looked it up and found that CLTC lab tests are conducted at 23°C, where lithium batteries perform best, but in reality, battery performance plummets in sub-zero winter temperatures. The most deceptive part is that the test cycle lasts only half an hour, not even long enough for the battery to enter low-temperature protection mode. Now, whenever I see a CLTC range claim, I automatically discount it by 30% for real-world mileage. For a 50 km round-trip commute in Beijing during winter, it’s normal for the displayed range to drop by 100 km.