I charged my model 3 to 90% ( ~ 63kWh) on March 16. For 10 days since the last charge-up, I used 18kWh (for 96.6 miles at 186Wh/mile), but the remaining charge is ~ 36kWh (198 miles range left at 182Wh/miles per Energy app on Tesla).
So, I lost about 9kWh ( 63 - 18 - 36) due to the phantom...