I'm on my third 6.0L. 2007, 2008 and currently a 2014. All of them have been 2500s and 4:10 ratio. Consumption rate has been pretty standard across all three. 20-22L/100km as an average. City, highway and putzing around on the back roads. Not great on fuel but I like them. The worst mileage I ever saw was purely my own fault for even hooking on but the truck was full to the tits upon departure and my fuel light came on after I drove 192km.
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