How do you reset mpg on citroen xsara picasso?

To reset the MPG (miles per gallon) display on a Citroën Xsara Picasso, turn on the ignition without starting the engine. Use the trip computer button, usually located on the stalk or dashboard, to navigate to the fuel consumption display. Press and hold the button until the display resets to zero. This will clear the current MPG reading, allowing you to track fuel efficiency from that point onward.