Hmmm, I went away for a day and missed all this. Just one comment to add to the good information above, noting that it is all about the moisture, not the fact that it is 78% nitrogen or 93% nitrogen.

That is the claim that nitrogen is inert, and reduces the oxidation of tires. This is true, but there is one fatal flaw in the argument. That is that tires have an inside and an outside. Let's say you stop all the oxidation on the inside. Great. Now what about all the oxidation on the outside? Are you driving in a nitrogen environment, or in air? Add in sun damage, and the outside of tires is the only issue with respect to aging of tires, the inside doesn't matter at all with respect to aging.

Similar issue with respect to flamability. Nitrogen doesn't support combustion. How many fires start inside tires? As long as there is air on the outside of tires, you can have a fire (if you have fuel, and a source of ignition).

Same here---Nitrogen opinion has turned it's ugly head. Y'all need to loosen up--you're too much of a Debbie Downer.

Air from gas station machines feel wet.

Then get your air from a place that has a shop. Mechanics who have to buy their own air tools tend to ensure that the compressed air is dry, purely out of self-interest, in my experience.

As if you can feel any particular level of moisture, as if the cooling of the air as it expands doesn't fool you into thinking you are feeling 'wet'... just one of those perfectly autoque statements.

have you actually 'felt' air from anywhere else?

It's like Groundhog Day, ;>)
Here's the similar thread from 2009; not much new, imo.
Search Tab is fairly helpful on providing the same rub and
saw, the 2nd & 3rd time around on the Jukebox, imo.

Boyle's Law and basic physics is still in effect. ;)
GL, mD

http://www.xoutpost.com/bmw-sav-foru...gen-tires.html

Read this.

The Straight Dope: Is it better to fill your tires with nitrogen instead of air?

We've ruled out anything from the internet. And now this thread is turning into a Periodic Table.

Since I have a BA in Economics here is what I would like to add:

BGM, :rofl: ...

And, I suspect this thread is caught up between rational and behavioral econ theory; more behavioral, less "rational". ;)

Say what you will about nitrogen, but I had my previous set of Toyo Proxes filled with it on installation and not even once in 3 years (40,000+ miles) did I ever have to fill or remove any nitrogen to keep the pressure levels accurate. They were literally filled on installation and never touched throughout the life of the tires because pressure remained constant for over 3 years. I can not say the same for any regular "air" filled tires I have ever owned. The pressures with notrogen were surprisingly constant over this time period. This alone makes it a much safer bet for anyone (especially SUV owners) who may not check their pressures as much as they should. It does have it's benefits, regardless of what many have to say, imo.