What octane of gas (87,89,91) to use for 2010 Honda Civic lx-s?

I own a 2010 Honda Civic and I've been using 89 octane from chevron. I want to start pumping at Costco gas but they only offer 87 octane or 91 premium. What gas is factory recommended for a 2010 Honda Civic lx-s 4 door sedan?

87. Only the Si models need high test.

87 is fine.

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