Quote:
Originally Posted by Sedoy
Still do, as I said earlier, the octane rating for gasoline has nothing to do with the amount of energy per gallon. All gasoline grades contain almost the same amount of energy. Actually the energy content of premium gasoline is slightly less than that of regular due to its additional additives to withstand detonation ("knock").
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Can't tell if troll or serious. Toyota made the comment. I called it "milk toast." Higher octane fuel doesn't "contain more energy", but it "allows" an engine to make more power by allowing more aggressive timing and higher cylinder pressures before spark knock or detonation occurs. It seems the LX570 squeaks out an extra 2hp because the ECU is happier on 91 octane. I think it would just as happily detune itself 2hp when it sensed knock from running 87 octane and there would never be an issue.