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if you don't run at least 91 you risk pre-ignition in the combustion chamber, which can destroy the engine.
even if the pre-ignition doesn't reach that level, the on-board computer will retard timing in an attempt to avoid knocking - which will reduce gas mileage enough that I suspect you will actually use enough more gas to pay the difference.
as an alternative the ECU tuning mod will allow the running of "regular" through use of an alternate fuel mapping (I suspect it runs quite rich).
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