Probably due to very low running of the car. Done only 6000 Km in last one year.
But really enjoying the "sheer" power. Last journey saw me driving crazily on MW, doing Pindi Bhattian to Isb in 2 hours.
Next time I"ll target a 18kpl by steady 120 Km/h driving (And my long tours are almost always with full house, full boot :))