Toyota 2010 Prius Owner's Manual page 590

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Gasoline quality standards
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Automotive manufacturers in the US, Europe and Japan have developed
a specification for fuel quality called World-Wide Fuel Charter (WWFC)
that is expected to be applied worldwide.
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The WWFC consists of four categories that are based on required emis-
sion levels. In the US, category 4 has been adopted.
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The WWFC improves air quality by lowering emissions in vehicle fleets,
and customer satisfaction through better performance.
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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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6-1. Specifications
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