I have 2800 miles and mine has done 3 regens, each occurring every 800ish miles. The only reason i know is because i use the torque pro app with a bluetooth OBD dongle. I added some custom programs which tell me the soot level and regen status. The custom programs are from a guy on youtube, Chad Ivan. He created the programs based on the small Duramax but it has worked great on the 6.6. The only thing i notice different when the truck is in regen is the instant fuel economy. Normally, when coming to a stop, the reading is 99mpg. During regen, it was 30 to 40mpg. I would have no idea otherwise. Sent from my SM-G892A using Tapatalk