Toyota 2015 Prius, Owner'S Manual

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6-1. Specifications
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Gasoline quality standards
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Automotive manufacturers in the U.S.A., Europe and Japan have devel-
oped a specification for fuel quality called the World-Wide Fuel Charter
(WWFC), which 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 U.S., category 4 has been adopted.
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The WWFC improves air quality by lowering emissions in vehicle fleets,
and improves customer satisfaction through better performance.
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Recommendation of the use of gasoline containing detergent additives
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Toyota recommends the use of gasoline that contains detergent additives
to avoid the build-up of engine deposits.
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All gasoline sold in the U.S.A. contains minimum detergent additives to
clean and/or keep clean intake systems, per EPA’s lowest additives con-
centration program.
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Toyota strongly recommends the use of Top Tier Detergent Gasoline. For
more information on Top Tier Detergent Gasoline and a list of marketers,
please go to the official website www.toptiergas.com.
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Recommendation of 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.