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I have notice that in all my cars that changing from 87 to 89 has increased my mpg despite configuration e.g. 99 volvo s70 (5 cyl); 2004 nissan armada (8 cyl). I am not surprised that in my new focus, I got 34-36 mpg running BP 89 instead of 87. I am certain that the traffic I hit stopped me from getting 38+. My next fillup-sunoco 89 and I noticed my MPG dropped to 31-32 which I attributed to the power/performance I kept experiencing. I give 89 the edge just need to find the brand that gives me the best MPG. a cheaper options for performance-sunoco 89. I probably depend on where you live.
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