DO NOT use 87 unless you like engine damage. You'll get pre-detonation out the pooper.
I mistakenly ran 89 for a couple of tanks and it ran like crap.
I also ran a test on my old Celica (11 1/2 to 1 compression) by running "plus" (89 octane). My mileage actually dropped drastically enough that it was cheaper to run 91 or 93.
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