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I think Costco uses nitrogen as a matter of course. At least I don't remember them asking me if I wanted it on the last set of Michelins I bought there. Subsequently a Honda service rep told me they didn't check the tire pressures because they didn't have nitrogen anyway. Which left me saying wtf to myself since I had rebalanced tire pressures on the car any number of times using the compressor in my garage. Apparently mixing nitrogen and regular air doesn't cause them to explode or anything.
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