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OP, you have an interesting situation. I don't think higher octane fuel will help, since its only benefit is knock reduction. Still, it's worth the price of a tank to test if it helps.
Your timing should advance under lighter loads. I don't know why your Corolla behaves differently. The normal timing advance occurs under decreased load because of ECU mapping to avoid knocking. So, tossing higher octane into the picture may allow more operating time with less advanced timing. It's worth a try.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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