I bought this vehicle 6 months ago... and within couple of weeks after I bought it I did a tune up and the service as I felt a little vibration... it's a manual transmission car, but even after the tune up it does around 9km/l in city limits with A/C...
as the previous owner used toyota 15w-40, in my first service I used the same... but last week I switched back to 10w-30 as I thought thickness of the oil caused the low mileage...
Is there a connection between low fuel consumption and oil level drop...??