I have to chime in! Keep moisture out? Most tires get moisture in them from air when they are inflated because the service station or air pump does not have a water trap or it is not working. This is why they sell Nitrogen (rip off).
Air is about 78% nitrogen, 21% oxygen, and 1% other. Nitrogen is inert, non combustible, and non corrosive.
They sell you by saying " What happens to a rubber band over time? It loses its elasticity and strength. This same process occurs in tires inflated with air as the oxygen attacks the rubber molecules, working from the inside out until the oxygen permeates the tire structure and ultimately the tread."
When you look at a tire on an old vehicle that has set for a long time with "tire rot" where are the cracks? The outside take the tire off the rim and the inside is maybe slimey but I have not seen these cracks on the inside.
But it is only $9.95 a tire to use.
Yes you do get better mileage because most people are going to check their tires more often with it inside.
Sorry did not mean to hijack this but it gets me when you see dumb arse things like this.