Toyota Tundra 2015, Manual, Page: 522 / 576

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9-1. Specifications
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Non-recommendation of the use of blended gasoline (gasoline engine)
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If you use gasohol in your vehicle, be sure that it has an octane rating no
lower than 87.
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Toyota does not recommend the use of gasoline containing methanol.
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Non-recommendation of the use of gasoline containing MMT
Some gasoline contains an 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.
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Toyota does not recommend blended gasoline (Flex-fuel engine)
Do not use non-specified fuels such as the following.
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Fuels containing methanol.
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Fuels with more than 85% ethanol.
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Toyota does not recommend the use of after-market fuel additives (Flex-
fuel engine)
Do not use any after-market fuel additives when repeatedly refueling with
E85, as some after-market fuel additives are not compatible with E85.
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If your engine knocks
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Consult your Toyota dealer.
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You may occasionally notice light knocking for a short time while accelerat-
ing or driving uphill. This is normal and there is no need for concern.
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Use only gasoline containing up to 15%
ethanol.
DO NOT use any flex-fuel or gasoline
that could contain more than 15% etha-
nol, including from any pump labeled
E30, E50, E85 (which are only some
examples of fuel containing more than
15% ethanol).
DO NOT use gasoline contain-
ing more than 15% ethanol.
(30% ethanol)
(50% ethanol)
(85% ethanol)