OT: Nitrogen filled tires

Things seem pretty slow in SED today, so let's talk about "Hot Air".
(Like the kind in your tires.)

Every so often I read something like this:
http://fleetowner.com/news/topstory/fleet_nitrogren_beats_air/
suggesting Nitrogen is better than air for improved mileage, lower
tire wear, reduced Global Warming, etc....

The trick is you fill your tires with Nitrogen instead of compressed
air.

Huh?! Air is 78% (or so) Nitrogen anyway.
Is there anything to this, or is this a classic signal-to-noise
problem...??
Notice too that the article does not mention any service stations so
equipped...

-mpm

.

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