Quote:
Originally Posted by p nut
I'm saying that you CAN use it in an Si. It is RECOMMENDED that you use premium, but doesn't mean the end of the world if you choose 85. What makes you think that you can't? Most modern engines have knock sensors that automatically retard timing, so it's not going to blow up your engine if you use it.
The MDX has the same fuel recommendation.
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Maybe I'm wrong, but the everywhere I look the Si says "Premium Required" and the MDX says "Premium Recommended". "Required" generally means just that while "recommended" means you just take a few lbf*ft hit because the engine cannot advance ignition to the optimal point.
If you average 25 MPG (lower than most do with the Si) and 91/93 costs you the usual $.20/gallon premium over 87 then you'd be saving yourself a whopping $80 per 10,000 miles driven.
Use 87 if you're stuck with no alternative and drive it easy, then immediately go back to 91 or higher as soon as possible. That should really be the end of this discussion.