I'm sure there has to be previous posts on here somewhere, but they didn't pop out at me. I believe our stock 06 RT even w/ R&T pkg came equipped w/ a 2:73 rear end gear, which is pretty tame by any standards. I'm guessing they did this to achieve a fuel economy rating. I would like a performance boost with minimal effect on miliage.. how about a 3:08 or equivellant? Has anyone done this yet, and if so, how much mpg did you lose?