Im going to throw this out there: Not all vehicles have knock sensors, yet the ecu can still alter for different grade fuel...how?
Nearly all production vehicles are mapped to be extremely lean for emission regs
mines always bin run on super since i bought it, 128k miles on it...
suppose if ya aint got knock sensors using premium fuel is just wasted and of no additional benefits...
I will be using it again after ecu remap to get the best gains
Lambda sensors are going to have very little effect on octanes and ignition advance, they are treated separately.
Almost all cars have knock sensors, but I remember the non vanos M50 was probably one of the last like that. Those had rigidly set advance, and they wouldn't pay attention to different fuels.
Some newer engines like the E92 M3 now does knock detection with the spark plugs by ionising the gasses in the cylinder.
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