12kmpl appears normal. What was the mileage earlier? Has it changed drastically? A variation between 10-12kmpl can be expected depending on AC use, city driving conditions and so on.
For a start, if track the mileage for a consistent pattern. Between two tank-full refills maintain the same driving style (if you use AC considerably then don't stop using it completely or less than 80%). This will give you one set of mileage figures. Next change the driving pattern - use less AC and then see the mileage for a couple of refuellings. You will note that the two sets of mileage reading will be different. In the example I gave the latter style will give greater mileage. However within each set there will be a variation, so you will have to be patient and take multiple mileage measurements for each set, and arrive at the average.
S = k.I^2, where S is the amount of stupidity a species possesses, I is the intelligence the species has and k is the universal constant of stupidity.
|