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2004 Excursion w/6.0 PSD: 14-15mpg, mostly bumper to bumper traffic, and I drive like I stole it. I often drive iwth the seats down loaded up with 600+lb stuff in the back, with a 3-6k trailer behind me. I don't feel it, but my fuel guage does. Have gotten 17-18mpg flat highway.
My truck sees the freeway often so it gets no less 17-18mpg and a consistent best of 19.4 mpg (worst was 14mpg); around town it's about 15-16 mpg. This is with the mods in my sig, SCT set on Performance (econo tune), using Valvoline Blue 15W40, two bottles of PROlong friction reducer every oil change, and Diesel Kleen with every fill up. No towing, just haulin' myself around and my chick when she's with me.