I have a 2000 GT with cold air, pro 5.0 shifter and am going for gears next. The gears are stock and I am trying to decide what to put in. I still need gas mileage but want to livin it up a little. what do you guys think? 3.73s or 4.10s? I know 4.10s would really give a good kick but would it sacrifice my mileage?