1100 miles to go is an 'iffy' stage. At several thousand miles to go, the car is guessing how long, based on typical data it is programmed with. At a few hundred miles to go, it is pretty accurate as the wear sensor has been triggered. I'm not sure if at 1100 miles to go the wear sensor has been triggered, so I'm not sure if it is a reliable warning. I would wait until it gets to 500 miles before believing it.
I swapped the front brakes on my SD for S brakes and the service indicator is now having nightmares - it got as low as 1600 miles but is now counting upwards past 2000 miles!