My experience has been the same as Jamo's, virtually zero leaks even over a long period of time. My tires are now so old there showing some real bad sidewall cracking, stretch marks, tire rot, whatever you want to call it. I need a new set soon!
Now, as fate would have it, the right front recently started leaking down within 3 or 4 days of filling. Drops from 30 psi to about 15 psi and then holds steady. Can't find a nail or any obvious malfunction, could be the age cracks on the sidewalls I guess.
Caution, thread hijack in progress.
Moving soon, will get new ones once I'm on the mainland (looks like Houston, by the way).

Thinking about buying this place in fact, gotta love that 5 car garage!
