I have 3.73's and love them...changed the whole attitude of the car, as far as I am concerned. personally, i wouldn't get 4.10's, cuz i am of the opinion they are for track use, not everyday use. i drive mine on a daily basis on interstate (not all that far mind you, but interstate nonetheless), and i don't think i could handle them. i did alot of research on them and concluded, that for me, my driving habits, and my commute that 3.73's would be the best balance for
me. but thats not the same for everyone else, as they have different needs than i do. i
almost put in 3.55's but decided against it. i also take my car on monthly trips up to 7 hours long, and i generally run 80-100 mph on the interstate. 4.10's would be waaaay to high for me. two months from now, i might go down to 3.55's. right now, even lead footing around, i am getting about 19 mpg mixed driving. i might see 20 mpg all around if i can keep my foot off the gas and be disciplined about my shift points. i dont think 23 mpg would out of the question cruising at 80 mph. we shall see!
