The OEM tires are pretty weak specimens. Inserting a tube is often the easiest, least expensive solution to a chronic leak.I had a problem once before with this same tire losing pressure over time. So, if it starts losing air again after I air it up I'll take it to the tire shop. It might be something as simple as a valve stem. I hope its not the tire itself. Those things are pricey.
Thank you for your inputs. It helps a lot to be able to talk to people who know.
jack vines