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Well, your Avalon has an OBDII port. It's a simple matter to connect a gauge and see what the timing advance is doing.
My Acura runs 40 degrees advance when running on about 90 or above octane, but on 87 does a bit less advance during freeway cruise. When I'm regularly driving the car, I can tell what octane is in it just by feel. It has more power when I load the engine heavy at low RPM.
I got the same MPG though regardless of octane.
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