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I just bought a 2017 Lexus IS 300 AWD and the factory recommends 91 octane gas. Most gas stations don’t have 91 so I usually get 93 instead. Would I be able to put 89 in the car without hurting the engine or should I just stick to 91 and above?
 

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89 would suffice. However using 93 whenever you can would be ideal.
 
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