Sorry for the thread jack, BTW. I joined this for gear change info but a big driver for me wanting gears in to increase MPG, with the added benefits of better acceleration, etc..

 

KC_Kid, those 3.08s are killing you imho. They're only fit for the computer program that EPA uses to compute CAFE, not real world driving. The big-*** 20s probably make it even worse.

 

Those 20s are definetly quite heavy. Your engine really has to work to over come the wheel weight and wind resistance. Youll see a city gain for sure. I did

 

So 4.10s or 3.73s? I'm 80% city, less than 45mph. My 20% HWY comes from I-70 East-West driving, long graded hills, usually windy, running 75-80 mph. I'm leaning toward 4.10s but have 3.73s in the garage, they were bought used from a member on here. I doubt I'll change wheel/tire combo, unless I think it will make a huge difference, but that will be "down the road" a bit. Thanks guys for throwing in suggestions, it helps me a lot.

 

4.10s gets my vote

 

I second the 4.10s motion