I have had my car about 6 weeks, the car was fine with imperial settings but the app will change to metric within 1 minute of leaving the settings screen. HOWEVER, I had my car updated with latest software. Apparently the garage did everything apart from entertainment which is still at R28, and now the car keeps changing to metric which is really annoying as it is not just the sat nav that goes to km. But also the efficiency stats which become KWh per 100Km rather than miles per KWh. I suspect the app is overriding r the car so will look at unbinding the app in the next few days to see if it makes a difference.