Honda SH300A 2015 Owner's Manual page 29

Changing of fuel mileage meter unit:
!a Press SEL switch to select "km/L" or "L/100 km."
E type only
If the "mile" for mileage are selected, the fuel
mileage shown by "mile/L" or "mile/gal."
To end the selection, press SET switch.
!b
The established setting can also be set by
turning the ignition switch to
The control is automatically switched from the
setting mode to the ordinary display if the button
is not pressed for about 30 seconds. Even in this
case, established setting is maintained.
(Off).
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