Honda Super Cub 2019 Manual page 52

Refueling
Lower edge of
filler neck
50
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)