hi, My Ride have done 1.47lakh Kms and mileage have dropped to 6Kms per litre.From recent trip of 1750Kms i have got fuel economy of 13.5 Kmpl.No doubt car have gone sluggish with behaviour. i'm doubting why so much low efficiency ? Is it due to clutch? Fuel filter ? or Throttle body sensor cleaning? i have not seen clutch slipping at all,so can i ignore the clutch system change.