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Old 04-22-2020, 09:37 PM   #2 (permalink)
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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. (Iíve 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.
Iím leaning toward 90 winning but only by a hair

Will be interesting to see your results.
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