2015 Limited running like a top with 30,200 miles. I've encountered 3 regeneration's within the last 400 - 500 miles. My driving I'd have to say has been split between city and 12 mile highway hops. Fuel mileage has been in the low 17's. We had a new Kwik Trip super station open and I've been using their winterized gold diesel fuel. I've also been adding Power Service fuel additive. Am I doing something wrong? or perhaps the quality of fuel producing too much soot? again the truck is running great. This is my first winter with the truck is this normal?