My 2015 has 62k miles and I am in AZ too and I have a 70 miles round trip commute to work and work in the middle of the desert with zero shade and I charge on 110 there during the day and when I get in my car at the end of the day it's 140-150 degrees in the car.
And at night it's about 105 in the garage and I charge on 220.
My car uses 4.5kw now until the battery is out. But when I get to work (about 1/3 city and the rest freeway and rural road) it usually says 20-24 miles EV. When I exit the freeway, I have about a 4 miles road until I get to work. I use the Empower screen and can usually stay in EV mode until just about up to the guard gate unless there's cars behind me and I have to speed up and use gas.
Several months ago I think I was close to 5kw, so it's gone down almost .5kw in the last several months. For the first two years I was in California and now I'm in the miserable heat, so I think being in the heat has degraded the battery more than being in nice weather.