I had an 11 f250 that would regen every tank when intown driving. Around every 500 on the highway and almost never when towing. The ford would tell you when it would go into a regen cycle. My megacab cummins only told me 1 time to keep driving because the dpf was 100% full. Drove to 2min and 45sec and it dropped to 70% and stopped the regen. I have noticed two regens so far and I am about a 1000 miles into ownership. The very first xd I drove back in 16 flashed a regen notification when we were on a test drive with 70 miles on it. But i have not noticed any indication come up, just notice the mpg drop and the higher idle.