Model 3 battery architecture.

I expect the 2170 cells have 70% more energy than the 18650 cells. Based on the to-be-confirmed 2170 cells having 21 Wh (versus 12.4 Wh for 18650 cells) with 20 Wh usable , the pack architecture should be as follows:

60 kWh - 30P, 96S - 2880 cells. Each of 8 modules 30P, 12S with 360 cells. Total 60.5 kWh with 57.6 kW usable.

75 kWh - 38P, 96S - 3648 cells. Each of 8 modules 38P, 12S with 456 cells. Total 76.6 kWh with 72.3 kW usable.

As the base M3 60 has to get more range than the Bolt, but less than the base MS 75 - so a range in between 238 miles (383 km) and 249 miles (401 km). My guess is a range of 392 km (244 miles). 6.8 km/kWh (4.23 miles/kWh).

An M3 60D should achieve a range of 408 km (254 miles). EPA economy - 7.1 km/kWh (4.40 miles/kWh).

An M3 75D should achieve a range of 488 km (303 miles). EPA economy - 6.75 km/kWh (4.20 miles/kWh).