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On my Lupo 1.2 TDI we did over 25 different tunes/tests.
Fuel consumption went from 2.2 liters -> 2.0 liters mainly because of the ecu tuning.
So difference was about 10%.
Tuning and tweaking will continue next summer when same engine will be put to the Audi A8. We will try some different setups to learn more.
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