One thing I have not heard discussed is the all-too-common family visit. If I drive 200 miles to visit some family and stay at their house what’s the etiquette for using their power to charge my car? I wouldn’t feel comfortable asking and saying “I’ve got to leave for two hours to find a charging station” also feels awkward. I want to maximize our time together and not burden folks with needing to pay to charge my car.
Then pay them. It's not hard to figure how much energy you consumed and what the cost of electricity is, make a conservative estimate, round it up and give them the money.