I went out for a 44-minute run today that had 5 intervals. My watch shows 4.36 total miles run, but when I select the run on the watch to view the details, or when I sync the run with my phone app, it only shows 3.93 miles. Why would this happen? It's making my pace for the run way slower than it should be.
The only thing I can think of is that one of the intervals was a 5-minute zone 2 run, during which i ran 0.44 miles which is roughly the missing mileage.