The 92 definitely allowed more spark, but the accel curves for 87 definitely appear stronger. We know the energy content is the same and most of the “87 burns faster” stories are myths. However, I wonder....we know the refineries have had a huge surplus of diesel and jet fuel due to covid, and those fuels are a required byproduct of gasoline production which is still in decent demand. Could it be that they are blending some of these heavier, high energy fuels into 87 and the result yielding more power even at lower spark timing? The octane of those fuels is lower but refineries are constantly blending different components to achieve the desired end octane.