More compression is better.
Gearing is always a fuel ecomomy killer but on an 8x8 I don't think there is much you can do.
Water mist injection would help some.
EGR and catalyst hurt fuel economy.
EGR only helps by warming up the engine faster, beyond that its no good.
By far the best thing you could do is stick a turbocharger on there or install a more modern diesel.
Increased compression ratio - EcoModder
Turbo charging - EcoModder
Water injection - EcoModder
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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