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Originally Posted by Frankie_lala
i just recently filled my car up with 91 fuel accidently. its a 2007 corolla s type. does this mess the engine up in any way? or is this better for the engine. when i filled up the tank was empty not totally empty but close to it. so is this good or bad?
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filling up with 91 octane will not hurt your car in any way.
only thing it will hurt is your pocket. you don't need 91 octane/premium, 9th gen engines are made to run on regular unleaded (87). so you would be just wasting money if you continue to fill up with 91.
if you have the corolla XRS or matrix XRS, then you need 91 or higher.
all other models dont need 91.
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