Toyota PRIUS 2014 Manual page 628

6-1. Specifications
NOTICE
Notice on fuel quality
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Do not use improper fuels. If improper fuels are used, the engine will be
damaged.
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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.
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Do not use gasohol other than the type previously stated.
Other gasohol may cause fuel system damage or vehicle performance
problems.
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Using unleaded gasoline with an octane number or rating lower than the
level previously stated will cause persistent heavy knocking.
At worst, this will lead to engine damage.
Fuel-related poor driveability
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If poor driveability is encountered after using a different type of fuel (poor hot
starting, vaporization, engine knocking, etc.), discontinue the use of that type
of fuel.
When refueling with gasohol
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Take care not to spill gasohol. It can damage your vehicle's paint.
Notice about fuel
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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 5.3 gal. (20 L, 4.4 Imp.gal.) of fuel every 6 months (refuel a
total of at least 5.3 gal. [20 L, 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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