Lifetime EVIC versus Hand calc on my rig is the EVIC reading 3% optimistic. That is with 72 datapoints to back that up. Pretty sure it didn't include a regen on this, however it seems that the 1500 setup is similar to the Cummins setup in which the DPF is at the front of the exhaust stack and really close to the engine. Active regens seem to take place once every 3 or 4 tanks of fuel when I'm doing mostly highway driving. It gets to about once ever 1 or 2 tanks of fuel when stuck in city traffic.