Gathered that MAP x RPM was a representation for Air and the Duty Cycle was an indication of Fuel delivery. Still not sure how to really put that plot to use. One thing I see when you post those plots is that the Z axis tends to vary. For example, in the previous post you plotted AFF. In this link you plotted AFR. Z axis doesn't really matter for this? You just need something to give you hits? The second thing... What if you have some non-linearity in the plot? What is that telling you? Do you have example plots of such occurrences? If the curve has a bend down and to the right, that would mean less fuel being delivered for a given air flow. Does that mean the ECM is seeing a rich condition? Same token on the other side. If you have a bend up and to the left, that would indicate more fuel delivery for a given air flow. ECM seeing a lean condition? What if you have a wide spread linearity vs a narrow line? What's that telling you? At any given air flow you could have a widely varying fuel delivery? Why would that happen?

Just trying to see the utility of the plot - what it's telling me exactly and how it can be put to use.

That's why I said I like to keep it simple and look at plots like I posted. It's immediately apparent what I'm looking at and what it's telling me. Granted, I'm not an expert at this and perhaps there just something that I'm missing/not seeing in terms of value/utility in those plots.