Civic Si - Do you absolutely have to use premium unleaded? - Page 2 - Honda Car Forum

#11 (permalink)

06 Apr 2008, 11:16 am

jack D

Junior Member

Join Date: Oct 2007

Posts: 20

you should use it but its not absolutely required it helps get better gas mileage and use but its not necessary.

#12 (permalink)

08 Apr 2008, 04:24 pm

99HXCivic

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Join Date: Dec 2007

Location: Houston, TX

Posts: 55

Re: Civic Si - Do you absolutely have to use premium unleaded?

Just experiment with your car! Run down the tank, fill up 3 gals 87, see how it runs. If bad put some 93 in it!

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