It's underwritten by State National Insurance Company, rates are based on safety score and Tesla's associated accident data. Rate next month is actually a few cents lower than a couple of months ago when I had a 100 score. It was just over $30 then and goes up about $3 for each point under 100. I've only been as low as about 96, so I don't know what happens below that.
Exclusions include it doesn't cover using it for delivery service, ride sharing service, renting it out,
I double checked, it has all of the same coverages and limits as I had before (with USAA).
The best way to keep a high safety score is to use Autopilot/Full Self Driving as much as possible. Tesla's statistics show that makes cars far less less likely to have an accident. Nobody else collects fleet wide safety data the way Tesla does or includes Autopilot level safety on every vehicle they sell.
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