Model 3 supports three phase charging in Europe. TeslaFi does not correctly report kWh used when three phase AC charging a model 3. The reporting ignores whether the car charges on one phase or on three phases.
Example stats from my car today:
kWh added: 36.65 kWh
kWh used: 12.9 kWh
The charge session took 3 h 26 min.
I think the correct amount used should be 12.9 kWh * 3 = 38.7 kWh
Customer support service by UserEcho