2013 S85 with 74K miles. Pano roof. Aftermarket window tinting on side windows and rear window. Tesla shade screen installed in back window.
I live in north Phoenix, and keep the car in a west facing, uninsulated garage with a metal garage door (ouch). So, easily above 120F on summer afternoons, and rarely cooling below 90F at night. My 100% charge now indicates 250 miles (265 miles when new).
Feeling guilty perhaps about the above environment, I charge to 65% most days, pushing it to 100% only when about to go on a road trip. My research (citations missing - sorry) indicates avoiding hot temperatures at high States Of Charge (SOC) helps preserve the battery's energy storage ability.
I believe I've suffered average (normal) degradation. In other words, if there were a sister car to mine with similar miles living in a perfect, 70F year-round climate, it would also charge to 250 miles.
My experience is that Tesla's Air Conditioning system is very strong. Perhaps this is because it was designed for the worst-case scenario of simultaneously cooling the cabin and the battery pack. Five or at most ten minutes of pre-cooling is all it seems to take, even after hot soaking in the sun. I've only seen it fail to keep up once: Using the Yuma Supercharger at 2PM on a sunny August day. This supercharger is a back-in with west facing stalls. In that case, it appeared to give battery cooling priority over cabin cooling.
I have no value added feedback regarding the Tempe Service Center. If it matters, all my service work has been performed at the Scottsdale Service Center, and they have been phenomenally great.
A 100D S will be the cat's meow. We travel to Moab Utah several times a year. A 100D would easily make the Flagstaff to Blanding Utah run without needing to stop somewhere in Monument Valley for a charge. You should definitely get it.