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UPDATE
Percent difference, gas prices: 0.30 / ((3.59 + 3.89) / 2) = 8.02%
Percent difference, MPG: 2.32 / ((20.41 + 22.73) / 2) = 10.75%
Temperatures have only gotten worse over that period, while driving patterns have remained virtually identical. By now, the regular (87) should be "out of the system" since I've put in 1/3, 1/2 and another 1/2 tank of 93.
So far, the small amount of empirical evidence suggests running this vehicle on premium costs less as the percent difference in gas price is smaller than the percent difference in MPG gained.
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