TOYOTA 2011 Prius - Manual (Page 601)

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6-1. Specifications
PRIUS_U (OM47685U) DVD
NOTICE
n Notice on fuel quality
l Do not use improper fuels. If improper fuels are used, the engine will be
damaged.
l Do not use leaded gasoline.
Leaded gasoline can cause damage to your vehicle’s three-way catalytic
converters causing the emission control system to malfunction.
l Do not use gasohol other than that stated here.
Other gasohol may cause fuel system damage or vehicle performance
problems.
l Using unleaded gasoline with an octane number or rating lower than that
stated here will cause persistent heavy knocking.
At worst, this will lead to engine damage.
n Fuel-related poor driveability
If after using a different type of fuel, poor driveability is encountered (poor
hot starting, vaporization, engine knocking, etc.), discontinue the use of that
type of fuel.
n When refueling with gasohole
Take care not to spill gasohol. It can damage your vehicle’s paint.