FWIW, I keep a K-5 around for emergencies and some topless fun in the summer, and it gets 10mpg pretty routinely, even with the top off.
Its a mix-match of other trucks but what i know for sure is it has a sickly '73 350 v-8 (more like 7) with a leaky Quadrajet from an '82 350 (oh yeah, its got HEI from '75+), TH350 w/ NP203 (AWD), the axles are 3.08:1, and 31" all terrain tires. Dual exhaust also.
Maybe you can go up slightly on tire size to get a mpg. I'm 100% certain you can do better than my Hauls-All
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