[QUOTE] Been hearing ads for filling tires up with Nitrogen. So I called the dealer in one of the ads and asked the theory behind this. Nitrogen gas pressure doesn't vary with temperature resulting in the correct pressure holding causing better tire wear and better mpg. Also, the Nitrogen gas is a better seal against the aluminum rims. Any vibes on this??[/QUOTE] This is like, when I was still in highschool back in he early 60s.. (dating myself) Night shift at the gas station NO boss. We would pick on certain unknowing customers if we were asked to check the tires.. We would get oiut the guage,, and after a short pressure check.. Quote. "Ohh Miss Bridgman - You need to have the air changed in your tires, The air in them smells terrible" and we would have them smell the air from the tire. We made 50 cents a tire.. Back then 50 cents for a gallon of gas or 50cents for a pack of smokes. Sometimes we could get 3 or 4 customers for this a night. Ohh the games we played in the old days. History repeats itself. cheers Marv