I have been running on the same treadmill for a few months now and had been clocking an 8:45-9:00 mile on 7.0 speed on my treadmill. The last couple times I've run with the same speed, it's now tracking me at around an 11:30 mile pace. Has anyone encountered this issue before? I know that my treadmill display might not be the most accurate to track mileage but I ran this morning and the treadmill displayed 5.0 mil and my watch clocked me at 3.8 mi. Not sure what's happened.
Sounds like your treadmill calibration has been altered somehow. When finishing your next run I recommend you do a manual calibration as described in the manual:
