That means the Nio's figures are likely to fall by quite a substantial amount, bringing it closer in line with the Tesla Model S line-up, which offers ranges of 396, 405 and the forthcoming tri-motor Plaid's 520-plus miles.
That's because the Nio range figures quoted are based on the outdated NEDC test cycle, rather than the latest WLTP assessment which the US electric car maker's stats are based on.
This isn't the first time we've covered details of a new electric car from Chinese manufacturer Nio.
That's less than half the price of Elon Musk's forthcoming Tesla Model S Plaid, which will have the longest driving range of all the Tesla variants with a claimed distance of 520-plus miles on one charge.
This is the new Nio ET7 - an electric family car from a Chinese maker that has Tesla set firmly in its sights.