You will get a "level 2" regen when the DPF reaches 65-68 percent soot. You will get no indication on the EVIC or DID of this happening. Fuel flow difference is minimal, so seeing it on the instant fuel economy indicator is really hard. When you inadvertently abort a level 2 enough times and allow the soot level to climb to 80 percent, the truck will go into a level 3 regen which is what you experienced. Most level 2's occur every 85-150 miles in city and mixed driving and 225-300 miles on the highway. There is some argument as to how benificial it is to be able to monitor these regens and allow them to start and complete before shutting down. The exhaust will reach close to 1300 degrees during a regen. That is hard on any kind of metal and a slow cooldown doesn't hurt, not to mention if you didn't realize you were in a region and parked the truck over dry combustable material like tall grass, you may get a fire started under the truck. Don't laugh, it has happened. Monitoring will also keep you from going past a level 3 and into limp mode which isn't a good thing. I use a Scangauge II from Linear Logic cost was 160. I got it direct from them and it was pre-programmed for the ED. 10 minute install. There are other nice gauges out there no doubt.
BTW- if you want to get away from all the regens, you may want to look into a GDE tune from Green Diesel Engineering. Its an ECM swap. Guys over at the other forum are having great results with far fewer regens more torque, less turbo lag, and better mileage. I'm dropping one in later this year. Jay