To get the best MPGs you need a 2wd, OD transmission like the L460E or TH700 and 3.08 or taller gears.
Build a ram air intake like this:
11 inches of water, no more. - Diesel Place : Chevrolet and GMC Diesel Truck Forums
And convert to electric fans.
Turn up the injector pump.
Put on 31 inch tires.
The engine you get will likely be a "C-code", put a duel plane "J-code" intake manifold on.
And run at least 8 degrees of advance.
A free flowing forward of the rear axel dump exhaust too if you can. I didn't see a big mpg boost from this but it was part of my 25mpg+ setup.
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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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