350 miles of range is what the BMW i7 will likely get.
"According to BMW, the i7's combined power consumption is 22.5-19.5 kWh/100 km based on the often optimistic WLTP standard, or 22.5-19.5 kWh for every 62 miles covered. It's expected that both 71 kWh and 105.2 kWh battery packs will be available with the i7. Considering that the 516-horsepower iX xDrive50 with the latter battery manages a higher 23-19.8 kWh and a 380-mile range, that should mean that the i7 with the same dual-motor powertrain will attain a range of nearly 400 miles since the sleeker sedan is likely to be more aerodynamically efficient than the SUV. Of course, official EPA ratings will be lower. According to the EPA, the iX xDrive50 with 20-inch wheels achieves a 324-mile range, so a range of around 350 miles is more likely for the equivalent i7.

While the single-motor Mercedes EQS 450 Plus has a 350-mile EPA range, the dual-motor EQS 580 has a range of 340 miles. The Tesla Model S has an EPA-rated range of 405 miles and remains superior, but we think that the Germans are close enough to encourage enough buyers to take the plunge. As reported yesterday, BMW has gone to great lengths to ensure that the i7 is worthy of a place alongside the 7 Series flagship sedan. It has been tested in both extremely hot and cold conditions, and meticulous acoustic testing has been conducted to ensure that the electric sedan keeps occupants shielded from any audible intrusions. We look forward to the fierce but cultured electric luxury sedan showdown that will follow when the i7 arrives."