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You can use it, The ECU will compensate and pull timing but it will be AWESOME if instead of running pure 87 you can at least take the chance to do Half and Half (With Premium) so it rest at a middle ground (+/- 89 Octane).
 

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Nah the ECUs are pretty smart these days, If you have always ran 93 and suddenly drop to 87 the ECU will know right away due to the performance loss and possible knocking..

If you are already getting free 87 you might as well mix it with premium so you have a middle ground and still save some money..
 
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