Originally Posted by
HillRider
...BTW what makes you think nitrogen escapes much slower than air? Who ever told you is spouting nonsense. Air is 78% nitrogen already. This entire nitrogen in tires business is a scam for almost everybody.
I asked this question of a scientific type arguing for nitrogen in tires: Given that air is mostly nitrogen, if you just keep putting air in the tires and oxygen diffuses through the tire faster than nitrogen, the oxygen will escape, eventually leaving you with essentially pure nitrogen.
He then admitted that while nitrogen diffuses faster than oxygen, the rate difference is similar to the composition of air so that the above never occurs. That means there is no real difference to using air or nitrogen. Besides, how often do you pump your car tires?