Don't know if any of you have heard of it yet, but there was an article in our paper a couple of weeks ago about using nitrogen in your tires instead of air. According to the article Nitrogen is drier than air and helps prolong the life of your wheels and tires. It is also denser and does leak out thru the tire as easily. It listed a few places that do it and Costco was one of them. The article said most places charge about $3.00 per tire. I was over at Costco today, so I walked over to the tire dept. and asked how much they would charge to put nitrogen in my tires. He asked what kind of car I had and if I had bought the tires there. I told him I had an SSR and no, I didn't buy my tires there. He said, "OH, you have an SSR. It's kinda slow today so I can get you right in, no charge.