I just got back in from checking both front sides. It looks like I have a minimum of 4mm pad remaining at the lowest. Some measurements are 5mm, but I'll use the 4mm as the measurement. These measurements are the best I could do -- I didn't remove the pads and measure; I just finagled the ruler in multiple places on all pads.
I should have a little life left. The set of Ford SuperDuty pads I have on the shelf are 9mm new. So, let's assume the Ford factory pads were 10mm new; I have used 6mm in 55k miles. That's approximately 9.1k miles / mm. 64k miles for 7mm use, 73k miles for 8mm use, etc. assuming linear use for the remaining material.
I'll check again in spring.
I now see the 1 piece hub/rotor.
The bearings haven't been regreased, so I guess at pad replacement time, I'll replace the bearings. Or, could I get by with cleaning regreasing?
The rotors look clean -- very little grooving -- for some reason this set of factory pads and rotors have been absolutely fantastic for me. No pulsation whatsover, Maybe I can get by with having them turned slightly? If so, that would be the last time, but heck, if I could get say 110k out of the factory rotors, that sounds good.