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Originally Posted by hemiram57
As others have stated, unless your car is knocking, using anything higher than 87 will not only waste your money, but could result in lower gas milage and performance. For your car, stick with the 87.
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Almost no modern cars will knock under any (reasonable) circumstances. They automatically change the timing before you ever hear anything. You'll only notice decreased performance and fuel economy. Anyway, just stick to whatever the manual recommends.
Also, I'm not sure why several people here are stating that hardly any cars require more than 87 octane. All of the cars I've owned and all of the cars my parents have owned say that they need at least 91 octane. And these cars are/were all normally aspirated. But an Accord will probably be ok with regular.