WLTP vs EPA: Why the Same EV Has Two Different Range Numbers

Browse an EV’s spec sheet in Europe and the US and you’ll often find two range figures that don’t match — sometimes by 50 miles or more. The car hasn’t changed. The test has.

What each test actually measures

WLTP (Worldwide Harmonised Light Vehicle Test Procedure) is the European and global standard. It runs a four-phase lab cycle at 23°C, covering low, medium, high and extra-high speeds over about 30 minutes.

EPA (Environmental Protection Agency) is the US standard. It blends city and highway cycles, then applies a real-world correction factor — frequently around 0.7 — to bring the figure closer to what drivers actually experience.

Why WLTP reads higher

The gap comes down to that correction. WLTP reports a milder, more controlled result with no heavy discount, while the EPA deliberately shaves its number down. As a rough rule of thumb, WLTP lands about 12–14% above EPA for the same vehicle — though the real gap varies by car (roughly 8% to 15%).

Converting between them

A practical estimate is: EPA ≈ WLTP ÷ 1.13, or equivalently WLTP ≈ EPA × 1.13. So a 600 km WLTP car is roughly 531 km on the EPA scale; a 300-mile EPA car is about 339 miles WLTP. Treat 1.13 as a typical mid-point, not a constant — expect ±10% depending on the vehicle.

Which should you trust?

For real-world planning, treat the EPA-equivalent number as your grounded estimate and WLTP as the optimistic ceiling. Neither is wrong — they’re answering slightly different questions. The key is comparing cars on the same scale before you decide.