Toyota Tundra Quick Reference Manual page 692

6-1. Specifications
NOTICE
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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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Gasoline engine: Do not use gasohol other than that stated here.
Other gasohol may cause fuel system damage or vehicle performance
problems.
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Use of unleaded gasoline with an octane rating lower than 87 may result in
engine knocking. Persistent knocking can lead to engine damage and
should be corrected by refueling with higher octane unleaded gasoline.
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When use of non-specified fuels (Flex-fuel engine)
The use of non-specified fuels will have a negative impact on starting and
driving performance, and will cause damage to the fuel system components.
Therefore, do not add fuels such as the following.
• Fuels containing methanol
• Fuels with more than 85% ethanol
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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.
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When refueling
Take care not to spill fuel.
It can damage your vehicle's paint.
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