I verify 2400rpm @70mph for 3.73/5speed auto.

Although my math tells me 2275 rpms for a 32.1 inch tire? Where's that 125rpm difference at? I know there's some sidewall bulge but at 37-38 psi?

 

Just got back from a trip. I'm a moron. 2400 rpm at 70mph. You were right 2000rpm at 60mph

 

2013 with 6 speed and 3:21's.
Really wanted the 3:73's, but almost impossible to find in my area. Bad enough the dealer had to go 110 miles to get my 6spd Dozer.
It turns out, that the 3:21's aren't as bad as I thought they would be. Mostly have the Jeep for the beach and snow, so the move to steeper gears is near the bottom of my list. MB TKO's and 265/70r17 Grabber At's are coming

 

I run 265/75-16's which are almost identical height as the 265/70-17's and I like that size. Bigger then stock but not so big it kills power with the 3.21's.

 

But my mileage is still much improved around town and the way I drive. Still wouldn't go back to 3.21 on the unlimited. Maybe on a lighter 2 door.

 

35 inch nitto trails on 18x9 XDs with 3.21s. Not that great but isn't that bad either. They are doable but I'd rather have 4.88s.

 

Had an 07 JK with 3.21 gears and a 6 speed, now I have a 13 JK Rubicon with 4.10 gears and a 6 speed. I liked the way I could drive 75 MPH at 2100 RPMs in the 07, but there is a lot more power with the 4.10 (of course the newer engine could be a big part of that). I'm not used to changing gears yet, 1st gear seems so short now, 3rd gear feels a lot more powerful, and 6th gear makes me check the gas gauge. All in all, I like the performance of the 4.10, but I miss my gas mileage.