APRILIA tuono v4 Owner's Manual page 25

Two kilometres after the low fuel warning light turns on, the kilometres travelled with
low fuel are shown on the digital display.
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Pressing the centre button of the MODE control while the low fuel warning light is
active temporarily deactivates the warning light for 60 seconds.
At "KEY-ON" the indication of reserve can have a delay of 60 seconds.
The instrument panel can display instantaneous fuel consumption
The instrument panel can display average fuel consumption since the last journey log
reset
Upon entering reserve, the distance in Km (or mi) travelled since entering reserve
state is displayed instead of the trip counter
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