I am thinking of having the nitrogen treatment done to my H3 tires.
Any one tell me the pros and cons?
Can I top off my tire with air when the nitrogen runs low?

 

The only benefit to nitrogen in your tires is the constant pressure as the N2 doesn't expand and contract as much as air does. So, in the summer you inflate the tires to 33psi, they will stay at 33 psi in the cold of winter. You can top it off with air as it seeps out, but after a while you will not benefit as the air will displace the N2. Be careful and know the dealer, cause some dealers have been known to sell "premium" nitrogen and jack up the price. IMHO, air is already around 75% nitrogen so spending money to displace the 25% is pointless, again my opinion.

 

totally agree

i did that to my sister's car so she wont worry about the tires for a while