Hi Everyone,
I've spent my life in the tire business so here is a couple of my thoughts:
Nitrogen is way overrated. It does help a little but you still need to check your air pressure often. A recent study on car tires that sat in a garage for ten years only showed the nitrogen filled tires had lost 2 psi less the the regular air tires. Nitrogen does run a lot cooler. That's the big plus. Keeps the pressure more constant on long runs. It is used in mining operations all the time. I think it makes for a little harder ride. But, everyone should be using it to gain the little advantages.
Never fill tires to the sidewall reading. Always us the owner's manual. The amount on the sidewall is the maximum for the tire, not the recommended pressure for the load.
Always check tires when they are cold. No exceptions
As mentioned in the previous posts tires always leak. It's just so!
I've noticed on my Rocket that I can tell if the pressure is off 2 psi. So, I'm always checking the tires. It makes a world of difference in the handling.
Carl