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Yes, I searched before posting. :D I have a 2015 Sonic with the 1.8L and am still looking for an authoritative answer to the question of whether using a higher octane fuel offers any definitive benefits. It seems to run a little happier in the heat of the summer with 91, but that could just...

Just checking in and saying hello. Original owner of a 2015 Sonic LS sedan with 67k miles on it. That little car has motored me all over the state for the past 4.5 years and is still going strong. Thanks for the add.