EPA is more realistic to USA driving patterns if you include high-speed freeway driving. However, the average speed of the high-speed test is only 48.4 mph. This link shows the tests: Detailed Test Information
We contacted Steve Huntingford, editor of What Car?, to ask him what caused such differences. Hard feelings due to the Independence? A protective approach towards Jaguar and the Korean brands? Joking aside, it has to do with each manufacturer’s priorities for him.
“The nature of the (European) WLTP cycle is different from the (US) EPA cycle. The EPA test emphasizes long-distance cruising, which of course is more common in the US, with its geographic nature. WLTP is about shorter, start-stop driving, more common in Europe,” said the editor.
Huntingford believes that the Kona (Kauai, in Portugal) and the Niro EV are relatively small cars, more European focused. So they would have been tuned to go well in WLTP tests. Tesla models, on the other hand, would be more focused on the US, and thus tuned to perform better in EPA cycles. The I-Pace adopts a more neutral approach towards the two test cycles.