Just talked to my service tech at dealer. He said the cummins guy's were there last week and said they were working on a way for us to put truck into regen when we want or need to. Probably another flash when it comes out, but that will be a hell of a lot better than the guessing game. I actually called them about the ax flash. ( I think that's the latest one, right?) Does that do anything for mpg's? I just don't want to get it if the fuel milage is going to go backwards.