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Just out of curosity . . . I just got a coupon in the mail from my home dealer offering to top of the nitrogen in my truck tires for free, assuming they had leaked down, of course. For one thing, the nitrogen isn't supposed to leak as readily as air and (2) anybody know if/when they started actually filling these tires with nitrogen?
Logic would dictate, marketing gimmicks aside, that they wouldn't offer to "top-off" the tires if it wasn't already filled with nitrogen.
I dunno . . .
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