Dear fellows, I have driven ativ X cvt 11,000 km. I have noticed some reduction in mileage of late. It is giving me 17 km /litre now where few weeks ago I was getting 19 kmpl on my daily commute. Still without AC. Tyre pressure is optimum and I am using recommended 5w30 taglon x oil. Don't know the reason for this drop. Do I need throttle body tuning or anything else ? Or should I ignore it?