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I missed that you have such short trips, I have to commute a ways so I am used to only worrying about long trips and highway. I don’t have any expertise on diesels and short trips so I can’t comment on that. I have heard conflicting information on IDI being better at cold starts, I think the typically higher compression ratio helps, but I think the heat losses of the precombustion chamber don’t help matters unless you go through the trouble of having it ceramic coated.
The recipe I have used before for good MPG out of the GMT-400 platform involves the stick shift transmission and careful driving. I think in your case with the shorter trips, a 350 and NV4500 would be the better power train option over the 6.5L.
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