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Message: <blockquote data-quote="EricM" data-source="post: 2008460" data-attributes="member: 20286">I just can't understand!  Her dee der...Please just stop patronizing me.The "auto octane" is marketing BS and you know it.    Using that nomenclature, you fool people who have no idea what a load based calibration strategy even means into thinking "This tune knows what octane is in the tank and adjusts for it".  That's not the case at all.    The truck has no idea what is in the tank and there has to be knock for your tune to "auto-adjust".Knock damages parts.   The knocking noise is the rod being slammed downwards by pre-ignition as it's still coming upward in the bore.  The knock is the bearing surfaces slamming against each other.  Using that as your trigger to identify low octane fuel while running a tune for high octane fuel is "less than ideal".If someone wants or needs to run 87, a specific tune designed for that is ideal.</blockquote>