If you look in your manual, because I do recall reading it, it says that if it's an "emergency," you can put 87 octane in. However, don't drive hard i.e. don't get on it.
When I had a CRX with a b16a (modded w/ JDM CTR cams, DC headers, high flow cats and Greddy exhaust), I always put in 89 and it didn't hurt it. My motor had over 100K on it and it still felt like the compression was strong....Hate to say this, but when I first dropped that motor in my CRX HF, I'm confident that it could beat a stock 370Z by a hair to say the least in the 1/4.
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