Huge variance from 1xx to 4xx. TeslaFi reports our 1350 mile average since end Sep as being 287 Wh/Mile. So 77% efficiency. But that should get much better as we continue to learn more secrets to getting better efficiency.
For me at least, temperature and tire pressure seems to play a large role. On days when its over 55F, not raining, and my tire pressure is 44 or higher, i generally get better than the rated range. If the temps are much lower, especially if I have to run the heater, then i see well over 400Kwh/mi.
Depends on the conditions and the type of journey. In our MS70D our best long journey worked out at just under 4 miles/kWh which combined A roads and speed restricted motorways. 70-75mph cruising is about 3 and a bit miles/kWh.
My wife's 15 miles each-way commute is more like 2.5 miles/kWh.
Model 3 will do better as it's lighter and has less drag (lower frontal area).
We've only had our car for a week under 6 months and we live in the South so we haven't experienced very cold weather yet but I'm told efficiency can drop by 15-20%.