I have done some work on km/miles today.
Firstly when you add a session it remembers the unit (km/miles) i.e. if you display or edit that session.
The application settings page is now working. So if you change your default unit to miles. It should be automatically be selected when you add a session. Also, totals should also be in the preferred unit.
There may be a few places where km is always the default unit but I will try and iron those out asap.
"Must tri harder"