Toyota PRIUS Manual page 650

6-1. Specifications
NOTICE
 Notice on fuel quality
 Do not use improper fuels. If improper fuels are used the engine will be
damaged.
 Do not use leaded gasoline.
Leaded gasoline will cause the three-way catalytic converter to lose its
effectiveness and emission control system to function improperly.
 Gasoline engine (EU area): Bioethanol fuel sold under names such as
"E50" or "E85" and fuel containing a large amount of ethanol should not be
used. The use of these fuels will damage the vehicle's fuel system. In case
of any doubt, ask any authorized Toyota dealer or repairer, or another duly
qualified and equipped professional.
 Gasoline engine (except EU area): Bioethanol fuel sold under names such
as "E50" or "E85" and fuel containing a large amount of ethanol should not
be used. Your vehicle can use gasoline mixed with 10% max ethanol. The
use of fuel with more than 10% ethanol content (E10) will damage the
vehicle's fuel system. You must ensure that refueling is carried out only
from a source where fuel specification and quality can be guaranteed. In
case of any doubt, ask any authorized Toyota dealer or repairer, or another
duly qualified and equipped professional.
 Notice about fuel
For plug-in hybrid vehicles, fuel may remain in the tank for a long time and
undergo changes in quality depending on the how the vehicle is used.
Refuel at least 20 L (5.3 gal., 4.4 Imp.gal.) of fuel every 6 months (refuel a
total of at least 20 L [5.3 gal., 4.4 Imp.gal.] over a 6-month period), as this
may affect components of the fuel system or the gasoline engine.
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