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Isn't all we need to know is whether or not the 1FZ has a knock sensor?
If yes, then higher octane = more power and more efficiency under a load that normally would cause the engine to knock on a lower octane fuel.
If no, then no difference.
I know that higher octane fuel doesn't make more power on its own and accept that lower octane fuel, all else being equal, possibly has higher energy content.
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