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Geez.... overreaction. Toyota knows that there are some times when you won't be able to get premium gas. Hence, the engine will react to detonation by retarding the spark.
Just think dilution. You have 89-90 in the tank now, since your father filled only half a tank. When it goes down to one quarter tankful, you can boost that to 91 by adding 93. Problem solved. Just go easy on the engine, particularly under load such as going up hills and you won't induce detonation. Relax.
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