Here's a page that gets into all of the various possible ranges of Tesla cars, depending on model and type of driving:
https://www.teslamotors.com/blog/driving-range-model-s-family
Correcting the math, when you start each day, you would have available nearly the maximum range, which could vary by model, highway versus city driving, and speed, all the way from 183 to 295 miles. Using your example as a guide, I'll pick 270 miles. Then, when using the supercharger for a half hour, your get the 170 miles.
Of course it's very interesting, so I thank you for the link.
However, my point (and my math) doesn't change, and the math depends on how you drive. As of today, an electric car either increases travel time or decreases your freedom of movement. You can't have both ways (and I won't even mention that fast recharging stations aren't everywhere, which is more of an infrastructure/political problem rather than a technology problem).
You have to plan your trip according to the battery life. You can't do like I did. I used the car for two or three hours around here and then I went to KS. Ok that I am kinda crazy, and my driving style and day trips are not your average trips, but using an electric car would've been simply impossible for me. Again, I am simply pointing out that (unfortunately) with electric cars something gotta give. I am sure that the technology will mature, and I am sure and hope to see reliable electric cars, but this is not now especially given the price the customer pays to get less.