Toyota 2012 Highlander Owner's Manual page 562

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Toyota does not recommend gasoline containing MMT
Some gasoline contains octane enhancing additive called MMT (Methylcy-
clopentadienyl Manganese Tricarbonyl).
Toyota does not recommend the use of gasoline that contains MMT. If fuel
containing MMT is used, your emission control system may be adversely
affected.
The malfunction indicator lamp on the instrument cluster may come on. If
this happens, contact your Toyota dealer for service.
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 will cause the three-way catalytic converter to lose its
effectiveness and the emission control system to function improperly.
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Do not use gasohol other than that stated here.
Other gasohol may cause fuel system damage or vehicle performance
problems.
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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 with gasohol
Take care not to spill gasohol. It can damage your vehicle's paint.
6-1. Specifications
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