As for the stability issue I beg to differ. I've had nitrogen in my tires since I had my wheels put on last spring. Usually (with air) when the weather changes my light comes on and I have to put a few lbs in the tires. Well I made it through summer, fall and I'm thinking this stuff really does work . Well the temp drops to 10-15 a couple of times and on comes the light. I get it topped off at my son's garage and I figure I'm ok. Two weeks later the light is on again. Each tire was about 3 lbs low. No leaks I can see but again temperature swings. So I topped them off this time with air. In a few weeks I'll have my new tires mounted and we'll see what happens, the shop uses nitrogen but so far I'm not impressed with it. If it costs you money I would say stick with air.