I have noticed in my runs over the past few weeks that my time over 5k has improved by a couple of minutes having plateaued at a pretty consistent level all summer.
I don't think it is a Runkeeper aberration as it has been a steady improvement. (Although on one famous occasion in early Spring Runkeeper did maintain that I had run 14.7K in 20 minutes which was exciting but sadly not true!)
The only thing I can think of that has changed is that the weather is cooler and I don't get so blooming hot during the run.
Has anyone else noticed a similar effect - or maybe I am just finally getting better?