It looks like I might be about to buy my uncle's 2007 Avalanche. It is 2WD, LT2 with leather and 15,000 miles. 5.3L with towing package and LRD. I don't expect great mpg, but it's gotta be better than my current average of 13.6 (95% in-town, driving like granny). I don't know what the rear end is. Any gremlins or gotchas I need to look out for? Once I have it in my possession, I'll start asking more specific questions.