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As Caissel noted and I forgot to mention, An intercooler and duping the ECU would be huge improvements. The intercooler would be important to slightly lower combustion event temps washing to the cylinders. It also would let you get more air into the cylinder for a tiny bit of extra pumping.
Power gains sound a little odd, but the mpg claims sounds about right since he was cutting 2 psi out of 22 he was running 10% leaner than a diesel does anyway.
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