When E85 was 20% cheaper than 87, which in turn was 25% cheaper than 93,
I thought of running 50/50 E85/87 instead of 93. Knock resistance would
be there, and MPG would be down maybe 15%, but cost would be down more
than 15%.
It depends on what sort of corrosive damage might result, and whether
the needed enrichment would exceed the threshold for setting a check
engine light.
Since my thirstiest vehicle, the ML, is mostly driven in cold weather, I
would often put 5 gallons of 93 in and top off with 87.
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