You don't think I can answer these, do you. Well....
1. Pressure was checked at the start of the ride.
2. Pressure monitor indicated all was OK (monitor consists of compressing tire with hand once in a while).
3. If the only thing that was sagging was my axle, I'd be very happy.
4. It's a Taiwanese tire, not Chinese.
5. When I filled the tire, I overinflated by 20%, then let 20% back out. Remaining 80% must have been all nitrogen (OK, I stole that one from somebody on the nitrogen thread).