Ducati 749S 2002 Manuel D'utilisation Et Entretien page 140

Refueling (fig. 46)
Never overfill the tank when refueling. Fuel should never
be touching the rim of filler recess.
Warning
Use fuel with low lead content and an original
octane number of 95 minimum (see table "Top-ups" on
page 78).
Make sure there is no fuel trapped in the filler plug
recess.
E
50
Max level
fig. 46