I have a stock 2012 unlimited rubicon. I was wondering what air pressure you guys are running for daily driving.

 

I run the pressure shown on the placard that's on the driver's B pillar. 37 psi.

 

Stock styled tires go for the placard. Some larger tires with different load ratings may require a little research/trial and error.

on my BFG KM that came stock, 37 PSI.

 

I agree with both Demp and Ronjenx. With Factory tires stick with the B-Pillar suggestions as this gives you the best overall performance and gas milage for that tire/vehicle setup. If you go larger, you will definitely have to experiment a little. I run Pro Comp AT's 315/75/16s with 30lbs in them or they like to walk otherwise. Also keep in mind that if equipped with TPMS you may have to adjust the setting there as well unless you can live with the dash notification.
Good luck with your choice of pressure.
MTNBKR

 

No tpms. More concerned with tire wear then mileage since they are BFg mud terrains.

 

Boy, this question is going to illicit a ton of answers.

I've been playing with my on-road stock tire pressures in my stock Rubi for about a year now going everywhere from 28lbs to 40lbs, using the same tire gauge which, I think, is about 2lbs low but who really knows. I mean, how do you calibrate a tire gauge and, if you could, what would be the standard? It may be wrong but it is consistently wrong. I have about 5 tire gauges and two sets of electronic tire metering valve caps and none of them match up.

Anyway, IME and IMO, anyhing over 32lbs cold in the stock tires is a waste and only causes a rougher ride. Between 32lbs and 40 lbs, I notice no difference in tire wear or fuel mileage but a huge difference in ride using stock components. I actually prefer 30lbs cold. At no more than 32 lbs, the jeep feels right as far as steering and impact. When you start airing up it gets "jittery" and road walks a bit more. I like a heavier, softer feel when I drive. Like I said, this is with stock KM's and 100% stock suspension components between 40-55k miles.

Now, at 55k miles I just installed new Cooper's and all new suspension using Monroe Reflex shocks so I'm starting all over again but, so far, it looks like I will be going back to 30 lbs. I'm presently running 32lbs cold.
Like I said, my two pennies before tax...
A few pounds really does make a difference in the ride IMO. After all, these are 1/4 ton rated vehicles. Not the heaviest things.

The Jeep door has these tires at 37lbs cold. My 6000lb Expedition EL has it's tires rated at 35lbs at the door. Not sure who came up with those air pressures.

 

Yeah that's why I asked 37 seems like a lot to me. I will try out 32 and see how it feels. Thanks for the help

 

Yep. Stock tires = follow the recommendations on inside of door

 

Tire sizes and associated load rating can make a difference. The current Expedition EL uses P275/55R20 (31.9x10.8x20) while the current Rubicon is running P255/75R17 (32.1x10x17).

I do not know common load ranges for each size, but you are comparing two different tires despite the weight difference. I've seen both low profile tires and low load truck tires running 60psi. You have to consider more than just weight of vehicle versus PSI.

 

I found that 37 works on stock muds.