Toyota 2009 Tundra Owner's Manual page 641

6-1. Specifications
Toyota recommends the use of cleaner burning gasoline
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Cleaner burning gasoline, including reformulated gasoline that contains
oxygenates such as ethanol or MTBE (Methyl Tertiary Butyl Ether) is
available in many areas.
Toyota recommends the use of cleaner burning gasoline and appropriately
blended reformulated gasoline. These types of gasoline provide excellent
vehicle performance, reduce vehicle emissions and improve air quality.
Toyota does not recommend blended gasoline (Gasoline engine)
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Toyota allows the use of oxygenate blended gasoline where the
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oxygenate content is up to 10% ethanol or 15% MTBE.
If you use gasohol in your Toyota, be sure that it has an octane rating no
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lower than 87.
Toyota does not recommend the use of gasoline containing methanol.
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Toyota does not recommend gasoline containing MMT
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Some gasoline
(Methylcyclopentadienyl 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.
Toyota does not recommend blended gasoline (Flex-fuel engine)
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Do not use non-specified fuels such as the following.
• Fuels containing methanol.
• Fuels with more than 85% ethanol.
Toyota does not recommend the use of after-market fuel additives
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(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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contains octane enhancing additive called MMT