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Let's do some back-of-the-envelope analysis: I returned home with exactly 50% of charge.

With the 110V plug (actually 119V), I can charge at 12Ah = 1.4 kWh.

After charging for a few minutes, the car says will take 20h to charge to 75%, so let's double that to guess the total power I used today: 1.4 * 40 = 57 kWh. Or at least, that's the power I will need to pump into the battery from the gird...