Name a heavy duty pickup truck that DOESN'T get bad gas mileage... You can't, because they all suck.
15 MPG is about the best you can expect with a light foot and lots of highway miles.
You don't need an Allison transmission for the 6.0L gas engine. Stock 4L80E is fine. In fact the 6.0L and 4L80E combination is rock-solid, especially in 2006.
2006 was the last full year of production for the GMT800 platform and incorporates all the improvements since 1999. The only major problems with that platform were the intermediate steering shaft clunk, and the stepper motors in the gauge cluster going bad. Neither problem is major, and I think they were fixed in the new trucks by 2006.
The intermediate steering shaft clunk is fixed by a lube kit, takes 30 minutes. If your gauge cluster goes bad, there's a recall. GM owes you a new one.
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