TOYOTA 2011 Highlander - Manual (Page 570)

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6-1. Specifications
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Toyota recommends the use of gasoline containing detergent additives
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Toyota recommends the use of gasoline that contains detergent additives
to avoid build-up of engine deposits.
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All gasoline sold in the US contains detergent additives to clean and/or
keep clean intake systems.
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Toyota recommends the use of cleaner burning gasoline
Cleaner burning gasoline, including reformulated gasoline that contains oxy-
genates 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.
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Toyota does not recommend blended gasoline
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Toyota allows the use of oxygenate blended gasoline where the oxygen-
ate content is up to 10% ethanol or 15% MTBE.
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If you use gasohol in your Toyota, 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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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.