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While that may be a contributing factor, it shouldn't start throwing CELs from 91 vs 93. Even the lowest grade fuel should 'work' but just not optimally. This is a 2013 car, I doubt it's that sensitive to fuel grade to the point it starts having idling issues and throwing codes.
Also, to Toyota's credit, they've beat Subaru in reliability for the last decade on both year-old and 10-year old cars.
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2013 Scion FR-S Firestorm Red MT
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