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In theory if you can find non-oxygenated ethanol free in a lower octane it should give the best fuel economy. (I’ve only seen it in MN)
Historically there were some comments that the Insight required higher octane overseas but generally 87 has more energy content.
Not sure which would win out, I guess if money is no object throw in some 0w16 oil and dose the tank with some MMO and run a separate tank of each.
I’m leaning toward 90 winning but only by a hair
Will be interesting to see your results.
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