Brand new Titan 2016 XD Diesel. Runs great with nothing and good mileage then I hooked a trailer on, 3000 lbs and things went to sh*t. 37.5 l/100 kms or 6 miles per gallon. Dealer doesn't seem to know what is going on and when I contact Cummings they say they cannot help because of an agreement with Nissan. I live in the north of Canada and a return trip to the dealer is a 24 hour drive. I bought the Nissan with the Cummings because I thought this would be a very dependable combination but now with two trips out to look at the problem at LA Nissan in Leduc it is not looking so good. Soooooo another trip out and if no resolution I will be buying a very big sign and parking the vehicle right in front of the dealership if I can afford to get there.