I took my mother's mocco for a routine check at about 80k kms. Had the following done:
-Engine oil changed (Earlier was Havoline but it wasn't lasting even 2500 km so tried Kixx on a friend's recommendation)
-Spark Plugs Changed
-Transmission Oil was changed
-Coolant was replaced
Now the mileage has dropped from 15 km/l (With A/C urban drive) to about 10 km/l (with A/C urban drive) and the car feels heavier too
Any suggestions what could be wrong?