Not to toot my own horn, but I am!
Well, at least I'm tooting my truck's horn! Actually, my Chevy 3500 diesel dually (2014 model) in my signature below got me 19.5 mpg this last week-end (not towing) and it was not flat interstate d...
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The GM DIC on my vehicles gas or diesel is never more than a couple tenths off hand calculated. My LBZ Dmax 3500 gets 16.2 at best and pulling about 15K I get 8-9 depending on wind and elevation changes. If you getting 19 plus your doing real well.
