Hello gang. I was recently in Costco, and I saw a service brochure that recommended inflating tires with nitrogen as oppose to air (oxygen/nitrogen/etc.). Costso claims that pure nitrogen does not escape as fast from tires. Hence, the characteristics of nitrogen help maintain better tire pressure and as a result one gets better tread wear and more miles from a set of "shoes".

By the way, their pricing is very competitve as it includes "road hazard". Please note that Costco told me it would take them about two weeks to obtain the tires for my vehicle - 235/45/17 Michelin Pilots. Price $173.

Is this simply a marketing ploy or is it vaild science?