The best replacement for 93 octane is 87.

The best alternatives to 93 octane are rated as following:
★★★★★  87
★★★  87 octane
★★★  89
★★★  e85
★★★  95 octane
★★★  91
★★  91 octane
★  92
  89 octane
  110 octane
  97 octane

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Speaking about 93 octane, one probably shouldn't forget about 87 octane.

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