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One more vote here for 4.10's. If you are worried that it is too much gear, stop it. My girlfriend lives 2 hours away and I drive up there every 2-3 weeks and I barley notice a difference in fuel mileage from stock gears and my rpms are under 3,000 at 80. Get 4.10's and dont look back. I was in the same boat as you were when deciding on which gear to run and I am so happy I made the right choice. My .02
I'm in the opposite boat. I had 4.10s and I hated them. I'm running a 5.4 now so my comparison is slightly skewed... but when I was a NA 4.6 I wish I had gone with 3.73s... and now I love my 3.55s