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With the hotter weather, I'd use the mid-grade to high-grade just to avoid engine issues (knocking and pinging). But that's me....I use all grades, depending on my mood and account balance :D
 

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Santiago Peak Tour Guide
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I just tried low grade and I can`t tell the difference. I didn`t hear any engine pinging or anything. I have slowed down my driving style anyway so I can`t tell if there is a power loss or not. What I do is buy 1 tank middle grade and then the next fill up is low so they are mixed, no problems here.
 

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I run mid grade. But if I were on a long highway trip perhaps I would consider regular.

I don't think Toyota calls it a knock sensor but there is a sensor that picks up knock/ping that is most commonly caused by lower octane fuel & retards/advances ignition timming to compensate & eliminate it.
 
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