Honda SUPER CUB C125 2023 Owner's Manual page 56

Refueling
Lower edge of
filler neck
52
Fuel fill cap
Arrow marks
Do not fill with fuel above the lower edge of
the filler neck.
Fuel type: Unleaded gasoline only
Recommended fuel octane number:
Pump Octane Number (PON) 86 or higher.
Tank capacity: 0.98 US gal (3.7 L)
#
Refueling and Fuel Guidelines
(P.12)