That’s the official WLTP*, just as ICE official figures are always a bit optimistic.
But BMW efficiency is excellent and has been since they launched the i3, they put a priority on engineering efficiency and battery management and control, as an example we regularly get 4.5 miles/KWh in summer and 3.8 in winter……Audi are ***** compared to that, the Audis struggle to get 2.5m/KWh in most circumstances. The Korean makers are great on efficiency as well, it’s just down to getting it all correct.
*and it’s a f**k up…….😂
https://ev-database.uk/car/1701/BMW-iX1-xDrive30
I would expect 250 miles on normal driving summertime, maybe 220 winter, but it really does depend on driver, as you know.