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Some of the time turbo helps to lower fuel consumption like when accelerating etc. But when driving steady speeds you dont need it and it hurts the FE little. However you can remap your ECU programming to avoid that boost in steady throttle.
My lupo did have 0.5 bar boost when driving 100 km/h or 62 MPH. That boost if there so the EGR system could work. Now with custom ECU program there is no boost even at 120 km/h speeds. When you have done this modification turbon is always more fuel efficient.
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