Scott Norville wrote:
>
> The water vapor is the most heat-reactive and the dryness of the
> nitrogen fill is probably what would make any difference in tire heating/
> pressure. In the long run the lack of oxygen would help preserve the tire;
>

If there is enough water present that some of it is liquid at a
plausible temperature, it will cause a greater temperature-pressure
effect than the P-T relationship from the standard gas laws.  The change
in vapor pressure of water with temperature is significant; the warmer
it is, the more it changes from liquid to gas, effectively increasing
the number of moles of gas in the tire.

Larry A.