When I left for the National, that tire had 1800 miles or so on it. In the past, they had always lasted 7,500 miles, so I felt pretty comfortable leaving on a 3,500-mile trip on them.
The center wasn't bare until the last 50 miles or so before that pic. The left side, however was completely roasted and had been nursed 1500 miles by that point by staying off the power in left curves and by leaning it right on the straights to bias the wear to the right side. Worked like a charm but was strenuous. Had I been home, I'd've changed the tire 1,500 miles ago. I was in the middle of nowhere, though, and I do not trust anyone else to work on my bikes. Note that the plug is to fill a hole in the bare area on the left side of the tire. I must've picked up a nail in a curve. There was no wonky handling until the tire went flat. Even a brand new tire goes wonky when flat.