In Nebraska, ethanol, is required to be labeled, most stations have
regular, a 87 octane, midgrade at 89, and premium at 91 or 92. The midgrade
(called different names at different vendors, often "plus" or something like
that) is the one with 10% ethanol, and is always marked as such.
If I saw similar grades but not marked for ethanol or not maybe the midgrade
would still be the ethanol gas on a best guess. But I not sure if the
octane values/mixes follow the same formulation in other states though?.
Greg Lemon
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