Unless EPA has changed the procedure, which would apply to Leaf as well, Focus EV will not get 73 miles.
EPA used the 30% "adjustment" to reduce Leaf's range from above 100 to 73. That is how Volt's 40 mile got reduced too. This was a contentious decision and they may revise it.
Leaf uses about 21 kwh of the battery. That makes it 3.48 m/kWh (for 73 miles).
I think Focus will use about 18.5 kwh (80% of 23 kWh). If somehow Focus EV is as efficient as Leaf, even with 10% more weight, it will get a EPA rating of 64 miles. If it is 5% less efficient, it will get 61 miles.
If Focus uses about 18.5 kwh (90% of 23 kWh), it will get 68/72 miles.