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The procedure is on page 1.60 in the Operating Manual:
To reset the mileage before oil change/service, press and hold one of the display reset buttons for approximately 10 seconds until the display shows the mileage permanently.
It could also be on page 1.64 depending on what manual you have.
Scroll trough the menu until you get to Miles before Service.
Then press and hold for 10 seconds as stated above.
Currently in tolsen's garage:
Trekka 1.9 DCI, Smart Cabrio Cdi (65 - 85 MPG) & Ford Transit 2.2 Duratorq TDCi