"All V8's are full time 4wd, and have always had the 5sp auto. The V6's are part time 4wd and got the 5sp in '05"
My 06 V8 is not 4wd. It is definitely 2wd and as far as mileage goes- 17 in town and 20 on the hiway. I have a hair over 25K miles and the mpg is actual, not the computer.