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I have essentially the same truck, but without any tuners (yet).
When I first got it it (with 45 mi) it was running around 12 MPG unloaded.
From around 750mi - 4500 mi I did a long trip carrying a 2,000# camper and towing an ~8,000# trailer and it got about 10.5 MPG.
Approaching 11k on it now the unloaded, driven with a moderately light foot MPG is creeping towards 14 MPG.
Oil analysis showed fairly high wear metals and ~2% fuel dilution on the first change. The second change showed wear metals dropped off substantially and <2% fuel dilution. It seems to be breaking in nicely.
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