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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Not too bad! but not much better for a new diesel truck. My 12 year older V-10 Excursion when I had the 3.73`s would get 15 on the highway at 65mph! So I guess the 19mpg you are getting is good.
