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octane is all about pre-ignition and detonation under load, and not about energy (BTU) content.
Thus, *if* your engine ECU (1) has "knock"-sensor(s) and (2) is programmed to dynamically adjust ignition timing, it is possible for the engine to "re-adjust" itself to "use" higher octane-rated fuel, meaning better power and response, but seldom better fuel economy if the BTU content is the same.
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