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Originally Posted by stingc
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.
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Yeah, there's actually quite a few out there that require the higher stuff. But as you mentioned you won't HURT them by putting in 87 - you'll just reduce their performance significantly.
Basically, check your owner's manual - if it says unleaded, you're good to go with 87. If it says premium, get the expensive stuff.