This is the typical, monthly charging cost: 80% - Private home in Huntsville, AL, $0.12/kWh 15% - Free L2 chargers in town, $0.01/kWh 5% - In town SuperCharger, $0.31/kWh per Tesla App Bob Wilson
Two other statistics I'd like insight on: Miles covered and time spent at a charger other than home as I assume you are going to use your other car around home if the Tesla is charging. And perhaps is that charging costs for both cars?
The App doesn’t record the miles but over 85,091 miles, I’m running 226 Wh/mi. My current Travel meter is 297 mi, 57 kWh, 192 Wh/mi but this was reset pretty recently. It is a specific to Tesla App. Bob Wilson