"Eisboch" wrote in message
...

"Wizard of Woodstock" wrote in message
news
On Thu, 02 Jul 2009 19:50:17 -0400, John...same as yesterday.
wrote:

The local Toyota place will fill all the tires with nitrogen for $30.
Is it worth it? Thoughts?

Well, consider this - regular old air is 78% nitrogen, 21% oxygen, 1%
other gases and water vapor.

The advantage of nitrogen is that it won't diffuse through the rubber
because the molecule is bigger.


Although true, the relative size difference means diddily squat.
I get a big kick out of the claims. The reason that nitrogen filled
tires stay inflated better is because after spending 30 to 50 bucks
to have it done, people check the inflation more often.

It's nothing but a marketing scam.
Also, tires age, rot and crack from the outside, not the inside. Ridding
the
internal gas of reactive components to sunlight and weather doesn't help
the outside surfaces much.


NASCAR uses Nitrogen for the reason it is dry. No water vapor to change the
pressure drastically with heat. It may lose less in a passenger / truck
tire, but not enough difference to matter. I check my truck tires regularly
and still have to add once in awhile. And Costco used N2.