You are showing great results for the last 50km......What does your read out say if you changed it to the last 650Km's?
My 2015 6.2L GMC may show those low numbers for the 50Km readout but never that low for the longer 650KM.....maybe its me...
And by the way, I agree with your decision to drive a 1/2 ton gas over a heavier 3/4 ton and diesel....I weighed the costs and for the few times a year that I am pulling something, the 1/2 ton gas works for me too
I'm running the 5.8L.
I went to Kelowna for Christmas and it averaged 11.8 over the 7.5 hour drive (Just about a full tank of gas). If I wasn't doing 120 on the Alberta side I'm sure it would have done better. But then again its averaged over all so who knows. Slowing down in BC and free riding all the down hills in 4 cylinder mode really saves the gas. Alberta you do the same RPM for hours. No possible way to save on fuel economy other than slowing the speed down.
In town it will average as bad as 15l/100. It will drink it if you are heavy on the skinny pedal as all trucks will. Pretty tough to get good economy in the city.
So does the 6.2 now have the 4/6 mode? it didn't in 2010 when I had the 3/4 ton.