It is possible why not?
But you forgot to mention the speed you were going when you got only 4.94L/100km?
Just a few things that affect fuel economy:
Keeping the speed around 90km/h (105km/h on Polo clock could be 95km/h in reality)
Aerodynamics
Outside temperature, humidity
Tyre pressure, type and condition
Flat long roads or hills.
Stop start
Weight the car is carrying
Mechanical condition of the car. ( if new are there any modifications?)
And the most important is the driver's experience and knowledge how to achieve the best fuel economy
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