Try the following steps to optimize the distance calculation algorithm of the app:
1) Make sure to enter in your height, as this will help the app determine your stride length, for improved accuracy
2) Adjust the “Sensitivity” option of the app. If the distance calculated is too short, please slide the circle to the right (max is 2x). If the app is over-calculating distance, then please slide the circle to the left.
You can find these adjustments in the app settings under “Height/Weight”.