I always figure they're like my truck tires, they go up about 3 pounds when they're warmed up. As far as the leaks, take a little soapy water, put it around your valve stem, after you take the cap off, put it on the tire itself, best if you have jack so you can spin it around. If you see any bubbling coming out there it is. Even check where the rim and tire meet, on both sides at the bead. You could have a leak there if they mounted it and got some shit in there. Soapy water works really well because it starts to blow bubbles like little kids do, lol, so you'll know instantly! You can buy a little small tire schrader valve tightening tool, the little button you push inside your tire valve to let the air out, and you can snug it up that way if they're loose...Kevin 👊 👊 👊