I've had the same issue, and was told that on June 28th, GM released a document to dealers titled "PIT5695 Brake Pad Life % Calculates Down too Quickly". Seems we all of us having this issue are not crazy or driving our trucks wrong:-) I found with the dealer for 3 days on this one, and they released this on the day I went to pick up my truck from the service dept. Still no update, but they GM is aware of this and apparently has a software fix. They told me that the update would need to be performed at the dealer...
https://static.nhtsa.gov/odi/tsbs/2019/MC-10162168-9999.pdf
