I ran home from work last night. According to the online run/map site I use it was 1.8 miles. Part of the run is along a bike path with distances marked at every intersection (To the tenth). Both these markers & the online thing agree the path is one mile. So those two are in agreement of that portion at least. When I got home Nike told me I ran 2.3 miles. A half mile difference for that short a run is significant.