If I ever get it to drive 200 miles on a "full 250 mile" charge, I'll wet myself with glee.
I suspect that you are "doing it wrong". My wife has a Tesla, and had the same problem, but when I drove her car, I got even better mileage than the indicator. So I watched her drive, and then I mansplained what she was doing wrong. Since then she has gotten much better milage.
In an ICE car, the "accelerator" pedal controls the rate of power going to the engine. If you push on it with your foot, the car speeds up. If you take your foot off the pedal, you coast. On a Tesla, the "accelerator" controls the SPEED OF THE CAR. If you lift your foot, the car thinks you want to slow down, and engages the regenerative brakes. This feeds power back into the battery, but only at about 60% efficiency, so 40% of the power is wasted. Try driving with the power graph displayed, and watch how often it turns orange (regeneration engaged). Practice keeping your foot steady to minimize that. It will make a big difference.