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I have been seeing more and more Tesla owners parking in supercharger spots unplugged just so they have a better parking space to do their shopping. I am not sure how Tesla can address this.
Just today, someone parked next to me while charging at a very busy supercharger location and did not plug in. They just left. They know it will cost them to leave it plugged in so they just game the system this way.
This is just as bad as ICING, perhaps worse since they know full well what they are doing.