Quote:
Originally Posted by badattitude
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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Lol. I would love to see the source of this info.
Our truck does not have an inline octane sensor like some GM vehicles have. As already mentioned, it has knock sensors that will back off timing if pinging occurs. But it does not have the opposite, the ability to increase timing because it "senses" higher octane.