In my more impoverished student days, Iíve plugged tires more often than I can remember, always riding them until they wear out. Iíve never had the plug come loose.
But now that I have a decent income, an occasional unexpected $300 doesnít really impact my life, so I replace the tire. Over the lifetime of the tire, I donít miss the $300 half as much as Iíd miss the peace of mind. Throwing away a tire with 10,000 mi left on it seems a waste, but youíre also throwing away 10,000 chances for the plug to come out.
This fall, my rear tire got gashed by something on the I-90. The GT is awfully squirrelly with 0 psi even straight upright.