“Nor do I even know if 27K miles between tire changes in an ICE is normal for Alabama roads.”
I drive Alabama roads. I always get around 50-60 thousand miles on tires. Just replaced mine at 48000 and they weren’t totally bad yet. Something’s not right if you’re only getting 27.
There are a lot of factors that could lead to much reduced life. Softer tires with better grip, and a driver who uses it, could easily lead to half that. It’s isn’t a simple “everyone should get 48-60k tire life”.