Went from my old 3.55 truck to a 2010 with 3.92's. Love it for it's pep and towing ability. Might lose a little mileage on the highway at higher speeds but I also lose a little mileage at low speed due to the fun I have with a good looking truck with zest. Acceleration over gas mileage = fun and I'm almost 60.

 

i would also reccommend 3.92 axle i love mine and its nice to know that i can tow 10000 lbs when ever i want lol also 4x2 will not have ls u need 4x4 for that

 

2009 crew with 171,000 ... 321 rear end ... tow TT with it.
in town and a lil' high way but in traffic 16.5 -17.5 all day long .
highway close to 22 mpg ..... 20" tires with hemi