people freak out too much on this matter.
you are fine. you can drive around on 87 octane all day all night every month and be fine. the difference is your timing with change and you wont get the power the car could produce. while knocking/pinging is possible, its not too likely with today's technology.
on top of that, the biggest and hardest obstacle IMO, when you put 87 in, is to remember not to floor the motor. high compression is what is bad for the motor w/ low octane, especially going 5krpms and up. lower engine speeds wont show much, if any, of a difference.
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