Did a tire rotation and measured the tread on the original tires at ~31k miles. The rear (now front) tires had 4/32" (actually slightly more), and the front (now rear) tires had 5/32".
The tires are Michelin Primacy MXM4 T1 in 235/45/18.
The tires are Michelin Primacy MXM4 T1 in 235/45/18.