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You'll be fine. If you're so concerned, at about 1/2 of the tank, top off at 93 premium and you essentially have balanced it out to an equivalent of 91 octane. This is how they make 89 mid-grade anyways, 1/4 93 and 3/4 87.
You marriage on that other hand, probably over now. Expect her to bring up counseling all of a sudden in the middle of the night when you're trying to fall asleep. Don't ask me how I know.
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