Sounds like the 91 is better for your car. I have to run 92/93 in mine because of the blower but with the price of gas right now, I'd be using 87 if I could. If you bump the timing then the higher octane is needed.
Its not a bad idea to fill the tank at the 1/4 mark. The gas is actually what keeps the fuel pump cool and keeping it cool will help it live longer.
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