87 or 91? Regular vs Supreme
Active Enthusiast
Joined: Jul 2007
Posts: 244
From: Oregon
Re: 87 or 91? Regular vs Supreme
My Ranger knocked on regular from it's very first summer, so it's not carbon buildup. The one I had before it (2.3L I4) did the same thing. The owners manual says it's "normal" but I use midrange in the summer anyway.
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