I brought mine into the dealer today. A week ago I got a low pressure warning from the ecu for the tires. I filled them up after off-roading about three weeks prior at 45 psi. The two left side tires had dropped about 10 psi, the right front about 15 psi, and the right back about 20 psi. I immediately filled them right back up and monitored for the rest of the day; they seemed o.k....no air loss. I attributed it to the recent drop in temps in the northeast, although I couldn't explain the differences. I thought it might have been from hitting curbs or something (I do that more than I'd like with the wide wheel base, especially on the right side) Well, not even a week later, I get another pressure warning. I check the tires. Pretty much the same thing, except less air loss, but definitely more on the right side, and definitely more on the back right tire. I call my local dealership and explain, and they tell me to bring it in tomorrow. So, I go out to the truck later in the day and I hear air coming from the back right tire; turns out, there was a brass nail or something lodged in between the treads, slowly leaking air, enough though that I brought it in right away. This, of course, explains the back right tire, but not the rest of the tires. I also noticed slight craking/dry rot in between the tire treads when I saw that nail. The tires only have 8,500 miles on them. I'm guessing that they must be defective in some way, and I'm going to have to deal with a warranty issue. At least they are warranteed. Jeesh...it's good to know I'm not alone on this one.