The best replacement for 87 octane is 91 octane.

The best alternatives to 87 octane are rated as following:
★★★★★  91 octane
★★★★  93
★★★★  89 octane
★★★  91
★★★  93 octane
★★★  89
★★  e85
★  86 octane
★  85 octane
★  92 octane
★  85
  94 octane
  93 octane gas
  90 octane

Your alternative for 87 octane is not listed? Suggest!
Speaking about 87 octane, one probably shouldn't forget about 93 octane.

Other search terms related to 87 octane and their ratings are:
★★★★★ 93 octane
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87 octane
91 octane
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