Starting, idling and less distance driving has the horrible most effect on a car's fuel average, so you must have done some wrong additions. There was no way to calculate if you already had 15.6 litres in the car. Secondly the 2.6 liter per dot phenomenon is in my opinion a wild guess and has no authenticity. The fuel guage dots are only an approximate idea. I once drove my car about 10-15 kms even after the last dot vanished, on a ZERO dot. So I wouldn't be surprised with such a mathematical calculation that you did. You can't figure out fuel average being good or bad this way.
A certain distance may give you 0.5 kmpl and the next stretch may give you 20 kmpl. The only fool proof way is to calculate full fillups with full tank fuel being consumed for a couple of tanks to get a mean and then come to a conclusion if your car is giving a bad average. Judging is only gonna bring you mental surprises.
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