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Bought my used 2007 LBZ engine/truck last summer. It's the CC, L-Bed, dually, 4x4. The previous owner used a tuner and the computer was tuned when I got it. The tuner/box was removed so I don't know what was used. Last month I had a sensor go out and they reset it back to stock.
Tuned was 23 highway, 17.5 city, 12.5 towing (33' 5er @ 13,000 lbs)
Stock is 20 highway, 15 city. Have not towed with it yet.
Service manager (close friend also) at an independent shop says "No Tune" for towing. Money would be better spent on EGR Delete, upgrade air intake and upgrade exhaust.
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