Funny, but Tesla actually stopped advertising battery sizes when the model 3 came out. It's actually a bit of work to find out (answer: 54 or 62 or 75 kWh)
True, and this is precisely why they did it - this way they reap the benefit of any efficiency improvements. If their tech improves, it costs them less to build a "300 mile" car, rather than the buyer simply getting slightly more miles out of a 90kWh car.
