nah, thats a gimick to get you to buy their crap! almost every car tire place here has nitrogen. almost ALL new cars have it in their tires because of the tpms(tire pressure monitoring system) and regular air will f*ck with the sensors BAD! did you try a reputable place? maybe Midas or some chain tire shop, Sears? Costco? i swear they ARE out there! and if you put air in, it will do the same thing, expand and contract ALOT!