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You know, fuel indicators and oem on board computers are set up for specific engine parameters. So if you change fuel dose for example your OBC will show wrong numbers, unless you'll calibrate it. So you should measure FE changes in a long term using odo and pump. Then you'll know the % offset for OBC. If it can be calibrated then do it, if not you have to remember the offset and count the true numbers.
Usually (unless for BMW) OBC can be calibrated +/-20% but if you change fuel dose from 1.6 to 4mg it won't be enough.
You may go for ScaGauge, UltraGauge or OBDduino as well and after calibration you'll see the exact numbers for FE of your Skoda.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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