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Old 08-22-2017, 09:16 PM   #1
rexl
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question on octine

deville has been running premium owners manual says unleaded regular. can I change to regular?
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Old 08-23-2017, 08:08 AM   #2
Stealthee
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Re: question on octine

Yep. If you've been putting premium in then its been nothing but a waste of money. You only need to run enough octane not to knock. Any more than that is a waste and can actually harm fuel mileage.
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