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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That is good mileage. But to truly determine mileage it needs to be over several tanks filled at same location if possible or at least with truck sitting fairly level and fill to top of tank and always hand calculate.
