The best replacement for 89 is 91 octane.

The best alternatives to 89 are rated as following:
★★★★★  91 octane
★★★  93 octane
★★★  87 octane
★★★  91 gas
★★★  ti 84
★★  nspire
★★  87
★  258
★  hp 50g
★  87 gas
★  ti 83
★  ti nspire
★  55
★  85
★  hp 49g
★  ti 92
  ti-92
  ti 89 titanium
  cx cas
  93 to montreal
  ti-84
  86
  ti nspire cas
  ti-89 titanium
  nspire cas
  ti 84 plus
  ti 86
  ti-nspire
  ti-nspire cas
  88

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89
91 octane
93 octane