I would take it easy until it is gone, and then put premium in it next time.
The electronics will retard the timing to compensate for the lower octane but you risk going into limp mode and throwing codes if it gets really bad.
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12 X5 M - 06 X5 4.8iS - 03 X5 4.4i - 03 M5 - 02 X5 4.6is - 99 M3 Dinan S3 - 98 M3 - 92 850i-6 - 92 850i - 91 325ix - 89 M3 2.5 - and a few parts cars
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