Wsalam
First of all, many congratulations. Happy and safe driving.
For average, i am getting 10+ in full city traffic with AC (3 months old and 2500 KM driven). I believe it depends on the way you are driving and the route.
As per my experience, If the drive is mostly with turns, constant stops and speed bumps, it wont get anything above 8. Any long run will improve the avg. Keep driving and dont trust the avg shown on MID.
For other stuff, i have kept it all original. Just using Maguires Ultimate wax and turtle interior polish. Giving the perfect shine. Keep it simple and easy to maintain in longer run. What i have learnt, all these coating requires special care. Depending upon your car color, use and your habit of maintaining, you may consider applying PPF.