2kwik4u wrote:There are no means to "sample fuel" on the engine with a sensor. The only sampling it does is with the knock sensor.
This is what we are referring to, not a fuel sample sensor.
Sorry for the confusion.
I personally don't want my truck knocking all the time so I'd much prefer to have a good accurate base tune, and live without that.
This is kind of the point I was trying to make about the "Wait 4 Me" tune and that it would be better to have set fuel and timing maps (base tune) based on a specific octane instead of relying on the PCM to advance timing to get spark knock and then retarding appropriately every 6 miles.