Around 50 miles on the new "WLTP" cycle which is closer to the EPA method than the NEDC was. They're also squeezing in an Inline 6 where they had the 2L 4 cylinder turbo. https://www.motor1.com/news/265118/2019-bmw-x5-xdrive45e-revealed/ To get that mileage, I'm guessing they are utilizing something close to 30 kWh for the battery.
