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I don't think lexuspilot missed your point - he never said there was any more power in the higher octane gasoline. I thouhgt his points were totally relevent - most gas station in CA only offer up to 91 octane gas. If you use gas with a lower octane than recommended - 91 in our case, where 93 is recommended and your car is not performing optimally on the 91 octane, then changing to 93 octane from 91 octane will make a difference relative to what is was before - the difference manifests itself with the feeling of restored/more power. And, I do not mean it magically makes engine higher compression. True, replacing faulty ignition wires will not make your engine "more powerful", but what it will do is restore power and smoothness relative to what is was before (with faulty ignition wires). In either case you feel a difference.
The answer to the original question from Steven Choi is, 93 or 100 octane makes no difference because our cars are only rated for use with 93 octane. Also, mixing them doesn't help or work/not recommended. Most gas stations in California only offer up to 91 octane - the way to increase the octane to the recommened 93 is with octane boosters or with Toluene.
Larez2
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