Thread: What octane gas do you put in your Civic Si?
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Old 05 Nov 2007, 12:00 pm
Christopher Michael Christopher Michael is offline
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Join Date: Nov 2007
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Default What octane gas do you put in your Civic Si?
I have a 2003 Civic Si and the dealer said to use premium fuel only. The manual says to use regular. Am I wasting money by using the 93 octane, or is it actually better for the vtec engine?
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