I would start with a chevy half ton from the mid 90's amd retrofit a cummins 4bt turbo diesel from the same era. No computer anything. P7100 injection pump, oring head, head studs, and a smallish turbo. Lpg fumigation and a 6spd manuel (g56) would give it exceptional mileage possibly in the mid 40s the way I drive. Diesel dave would probably get in the 70s. The lumber rack would make aero mods kind of pointless.
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