I have less than 3,000 miles on my new car and experienced a flat in rear tire caused by a screw. It appeared as a slow leak at first & I had air added and drove a few miles and within a week it was flat again. So my question is should I keep the patched tire or buy a new one? Is there going to be no significant tread loss at 2,500 miles? So if I replaced it now I would not have to replace all 4? Thanks