While I was messing around last weekend, I took a peek at the spare and noticed that it has never been mounted. The specification sheet states that it should be at 61 PSI and there's not a chance that it would hold this pressure after 8 years. Unsurprisingly, it was only at 21 PSI when I checked it out. So something to check next time you get a chance and avoid getting a nearly-flat spare in case of a flat.