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Editorial
EPA vs WLTP range ratings, explained: why the same car gets two different numbers
One lab in Ann Arbor, one cycle in Europe — and a 0.7 adjustment factor that explains most of the gap. What each test actually measures, and why the numbers are never interchangeable.
Every range figure on an EV’s window sticker comes from a laboratory — but not the same laboratory. In the United States, the number comes from the EPA; in Europe, China and much of the world, it comes from the WLTP (or China’s CLTC). They measure the same car with different procedures, and the numbers they produce are not interchangeable.
The EPA procedure runs a fully charged vehicle continuously over the EPA city cycle on a dynamometer until the battery is depleted, recording the distance; the same is repeated over the EPA highway cycle. The city and highway results are then adjusted to account for real-world factors the lab does not capture — air conditioning, cold temperatures, high speed and aggressive driving. The most common approach is a 0.7 adjustment factor: an EV that achieves 200 miles in the lab test is rated at 140 miles for highway driving, per the EPA’s own worked example. The adjusted city and highway values are weighted 55% and 45%, respectively, into the combined figure on the label.
The WLTP, introduced in 2017 by European regulators to replace the old NEDC cycle, works differently. It subjects the car to a 30-minute driving cycle — four phases (low, medium, high and extra-high speed), covering 23.25 km per cycle, with speeds up to 131 km/h — at a lab temperature of 23°C. The vehicle runs successive cycles until the battery can no longer sustain the required speeds, and the range is calculated from usable battery energy divided by measured energy consumption.
The practical consequence: WLTP figures are typically higher — and less conservative — than EPA figures for the same vehicle. The WLTP runs at a fixed mild temperature with no air-conditioning load and no equivalent of the EPA’s 0.7 real-world haircut. Comparing a WLTP number against an EPA number is comparing two different measurements, not two versions of one measurement. That is why EV Technica records every specification with its test standard attached — and never blends them.
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How this story was filed
Two-source rule: every news claim above was verified against documented sources before publication. Specifications carry their test standard (WLTP, EPA, or manufacturer figure) — never blended. Source manifests are kept on file for verification and chain of custody. Spotted an error? See our Corrections page — corrections publish fast and in the open.