Quote:
Originally Posted by Old Tele man
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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Octane is for race cars. It allows for cooler combustion allowing more timing. The only benefit I see is the ability to add more timing, thus giving you a grunt more torque. I don't believe the gains in torque will help your FE enough to justify the higher price tag.