Lone Ranger here in Oz....
Having to do the math to convert litres and kilometres, but I been checking and I am getting about the same...
My 08 has about 3600 kms on it, so about the same mileage.. Still all stock.. Our speed limit here is 110 kph about 67 miles/hour and I am getting about 19mpg with my Crew Cab 4x4 2500 Duramax bone stock...
If I slow down to 100-kph 62 mile/hour-(hard, very very hard) I can get 22mpg highway only if I feather it... That is tops I can do and unloaded an not towing... But it is misery so I usually sit on about 110-115 70 mile/hour and get about 18.5 to 19... It all falls in a heap towing or in town, but that is expected...
I am headed for DPF Delete and Tuner and EGR block off...
Best of luck, from Australia
