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sir, your vehicle weights 14 tons. it has 8 tires on the ground, all of which have axles, drivelines, and lots of steering knuckles.
the tires are bias ply. I bet the mileage numbers you quote are overland offroad and not on the highway.
so what kind of mileage do you expect? Remove half the tires, drive it down the freeway at reasonable speeds, and you will probably see something as high 7 or 8 like every other semi truck out there running empty.
if you want better mileage, raise the compression. raise the fuel pressure, and update the injectors to something from at least the 80's or so.
after that, diesel is diesel - you are not going to see a huge difference.
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