Six 1.7 mile loops. Splits: 17:34, 18:10, 17:33, 17:23, 17:55, 17:37. Mostly cloudy. Took about 2 hrs to pump myself up to do the run. First 4 laps were uneventful. Some hints of pain in left knee for rest of run. For last lap, I definitely felt tired even though I felt proud that I was running 10 miles.