How long or how many miles does it take the computer to learn to get an accurate datalog? Reason being I'm using a fuel additive ACESIV that raises octane from 93 to 101-102 octane. So what I'm trying to accomplish is do a reset fill up with additive let computer learn the long term trims than datalog to see how it adjusts with a datalog. Also when you see negative knock numbers that corresponds with it adding timing correct? Thanks for the help, hopefully Shaun/AED will chime in here...