I'm not so sure on that one. The promoted map (advanced) shows the 4 tables on the LH side of the screen. If the 4 tables are not displayed, then the same map is used for all injectors when the injectors are active. At least this is my understanding. The ECU fires the part load injectors for only a short window of TPS as can be seen on the SLP map so any overlap or map "crosstalk" is minimized. For a better explanation, SCarter in "Performance/Modified" PC V section can handle this question. Personally, I like the 4 injector map better as I find I "land" in the transition TPS range a lot and don't like all the fuel that some maps (or Autotune) have there.