Inspire 2 time/distance/pace makes no sense

[shuly]

This is not a riddle. 
Today I jogged for 35 minutes/ with an average pace of 13’30” and only covered 2.66 miles. 
i relied on my phone gps. 
how can I improve the accuracy. 
sometimes I jog and run at the same session, so stride adjustment is not an answer

Moderator Edit: Clarified subject

[LZeeW · Accepted solution]

@shuly   Pace is minutes per mile.  The notation is minutes and seconds per mile.  Remember there are 60 seconds in a minute, so 13'30" is 13.5 minutes in a more mathematical notation.  So if I created this dreaded math word problem, "If Shuly ran for 35 minutes at a 13'30" pace, how far did they go?", the calculated answer is 2.59 miles.  As a long time user, I see this as an acceptable amount of error.

When you use your phone's GPS (or built in GPS with other devices), the distance is the GPS distance, so your Fitbit estimated stride length doesn't matter.

Does this help?