Honda CBR150R 2018 Owner's Manual page 22

Instruments
#
To reset the tripmeter [TRIP A/B] and
average fuel mileage [AVG A/B]
To reset the tripmeter A and average fuel
mileage A together, press and hold the SET
button while the tripmeter A or average fuel
mileage A is displayed.
Tripmeter A
18
(Continued)
or
Average fuel
mileage A
To reset the tripmeter B and average fuel
mileage B together, press and hold the SET
button while the tripmeter B or average fuel
mileage B is displayed.
or
Tripmeter B Average fuel
mileage B