*UPDATE*Calling Duramax owners 1st trip with camper bad fuel mileage

Sorry hearing about the damage to the house and camper. Yes these threads eventually turn into a p....sing matchs and get locked. So you mentioned a tune. I suggest Black bear performance, they are big into GM trucks. Your truck should get better not sure why, but you could need a dpf cleaning cause they all get clogged eventually and need cleaned or replaced. We have this issue at work with our Ford trucks, so the Dpf system filter get replaced or professional cleaning. Anyway keep us updated if this thread survives....