https://hardware.slashdot.org/story/22/08/03/003200/a-handful-of-states-are-driving-nearly-all-us-electric-car-adoption
We noticed this stark difference on our recent trip to the Midwest. Teslas are rare compared to CA. It's like spotting a Ferrari or something outside of a couple of enclaves.
It's true: I've only seen a Tesla a handful of times, and there is only one place I can think of to "fuel up" while on the road.
Meanwhile, when our Midwestern niece came to visit us and we took her to SF, it's common to look down the street and between parked and moving cars, see three Teslas.
We actually started picking brands to see how other brands compared. Hyundai and Toyota were still a lot more common than Tesla, but considering that some of those cars are 10 years old and almost all Teslas were Model 3s, which first hit the market in 2017 and didn't sell in large numbers until 2018, I would not be surprised if Tesla is the most popular brand in SF if you limit it to model years 2018+