The point where you could crib was taking delivery. You should have asked for verifying that the petrol is filled properly.
Don't calculate the FE in this haphazard manner. You won't get correct results. And no point in getting anxious about it.
Fill up the car till auto-cut, reset a trip meter and then drive till you get low fuel indication, and then fill up again till auto cut. Now divide the reading on the pump by the trip meter reading, and that would be the realistic FE of the car (called tank-to-tank method).
Let go of the small stuff, and savor the feeling of a new car. Don't let the 500 bucks of the 10 L petrol spoil the fun for you!
(Then when the FE will feel low, at the end of the tank, don't fret, come back to CW forums, and read a couple of threads on Spark FE, that will make you feel better )
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