Thanks tundrakc,
The reason I knew to try higher octane was I also have a Ford F-150 with 150,000 miles that has done it since day 1. The dealer just told me the ford was a "pinger" engine. Nothing could be done except run higher octane. So I did run highest octane and it still pinges, but I have had no problem whatsoever with the ford, except it pings. So I just got used to it.
Now this Toyota also does it so I am kinda ticked. I never tried the mid grade though, I never thought mid-grade would do anything? But I'll try it. Let me know how yours works out. I really don't thing pinging hurts the engine, just affects the performance.
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