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Interesting that it sill doesn't show up in the app for me, though it does in the car. I rebooted my phone and tried different things. The Superchargers all around Post do show up in the app (Plainview, Lubbock, Midland, Big Spring, Sweetwater).
The mystery continues! Post shows up in the car but not in the app. So I tried Tesla's trip-planning site, starting in Roswell, adding a stop in Post, with a destination in Abilene. Check out the bizarre route it gave me:
I’m in the car now. The supercharger is shown there (8 stalls available) but wasn’t automatically assigned on my imaginary NAV route to Lubbock. However I was able to add it to the route.
Well my car easily makes it from Sweetwater to Lubbock so I’m not surprised that Post wasn’t originally assigned. I usually add my preferred chargers to a given route anyway.