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You may have to look into improving things under the hood also. Synthetics, software upgrades, exhaust, intake; all things should be taken into account. Pittsburgh Power is probably the best for the Cummins, type them in and see what things they have for the ISC.
Look at my avatar; they make trucks that are shaped like my old W900 ( Peterbilt 389s ) get 8 mpg and better loaded ( 80K gross ) with near 900hp; and that's with engines in the 12.7 to 16L range.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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