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This is probably new information and will probably surprise a lot of people, but I have in my hands a fairly detailed article written in 1993 by a British Mag about the new 1FZ at the time, that specificly says that Toyota claims the new duel knock sensors and engine management system will allow the engine to make more power when using higher octane fuel.
I have no idea if this truly accurate or even possible. All I can do is report what the article says.
Of course, I always use regular and with these prices see no reason not to keep doing that. Besides, the power increase, if true, is probably a bit minimal.
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