I pull my spare tire every six months now...last summer the wife calls me from a parking lot, she was out shopping at got a flat tire...It was on my BMW so I took off to change the tire, as I was running some real expensive rims...I got the tire off no issue, put the spare on and it was at 50% air pressure

Thanks god there was a Costco right there and I was able to limp the car over for some air...
Never again will that happen. So I pull my spare out clean and check the air pressure.