[tdiggity]

Search Tesla vampire drain, it’s a thing.

The calculation is muddied even more because the tesla odometer doesn’t monitor two important things: vampire drain, and charging inefficiencies. The odometer only tracks power while your butt is in the seat (so if you park the car and use the ac, it will track that). This makes long term cost tracking hard: you can only depend on the miles driven metric from the car. You’ll need a separate meter to track total energy used to account for inefficiencies (power lost to heat and conversion) and vampire drain.

The car shows kWH used since last charge, and it almost never matched what my smart meter measures if the car has sat for days.