OzRob wrote:However for longer journeys, the best infrastructure in Australia is that of Tesla Superchargers and my supplying BMW dealer tells me I can use them. 2018 i3 has a compatible connector with Tesla but I wonder if anyone has tried this and whether if, for example VIN entry is required, Tesla will recognize a BMW one!
I think that you got bad advice because, at least in the U.S., Tesla is charging for the use of Superchargers if one doesn't have the free Supercharger use for life option. A Supercharger knows the VIN of the car being charged and can charge the account of the owner of that car. This would not work for any car brand other than Tesla.
Anywhere that uses the Mennekes Type 2 connector for charging (e.g., Europe) can physically plug in a Supercharger cable to an EV's charging port because in these markets, Tesla's charging port is physically the same as a Mennekes Type 2 port. However, I think that the signals used on the various port pins are incompatible.