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Thread: So what exactly happens if you run Premium in a 4Runner?
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Old 08-25-2021, 04:28 PM
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badattitude badattitude is offline
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Join Date: Jun 2011
Location: Madison, WI
Posts: 635
badattitude will become famous soon enough badattitude will become famous soon enough
I use premium exclusively, 91 pure gas. I believe the Dual VVT does adjust the timing. To protect the engine it takes about 1000 miles of consistent premium gas for the ECM to make the full adjustment. If you use one tank of of 87 octane the ECM adjusts back (retards) the timing immediately and you'd need another 1000 miles of premium to regain the ecm timing adjustment. Im not sure this is 100% accurate but it is what I've pieced together. My truck is fast! I'm getting 18.9 MPGs all summer.
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2015 4runner Limited - URD Y-pipe
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