I should get my gears in the first of next week. 35's on 3.21 and avg 17.1 mpg and feel pretty good about that. Getting 4.88 (6 speed) I was wondering how much of a change for the worse should I expect?

 

Depending on how you drive, and terrain, I'm thinking you might see a drop, particularly if you live in a flatland area. 17 is pretty good with 35s. A friend of mine did 6 speed, 4.88s and 35s and his mileage went to crap. (flatland driving).

You will at least be able to use 6th though you may find your rpm a bit high at freeway speeds.

 

That sucks Indiana is pretty flat. The power now is ok with tunner, but when the wind blows I feel like I am going backwards.