Because the rotary has two injectors per rotor and they are staged (see Mode 7 for details on staging), it is possible that the mixture

might be miss-matched differently when staged or not staged. You may have to match the EGTs once when the engine is staged

(low power) and again when not staged (high power).

So it appears that the EC2 has had the capability to adjust the different in flow rates across the staging event since at least 2006.  But, perhaps like many others, I was not certain  what conditions would signify this needed adjusting (until Steve's data and analysis)  and therefore never attempted any adjustment (my dumb!)  - my philosophy being if it is working well and you don't have a clue as to what/why you are adjusting something - then DON'T! {:>)

The only "problem" (actually more of an irritant than a problem)  I have ever encountered using the EC2 was the staging "bog" I would encounter while operating on the ground which I finally eliminated.  What I did was to enrich the fuel MAP in the 3-4 bins in the High MAP region that the engine point jumped to after staging.   This did solve my staging bob - but, after reading the EC2 instructions again, I can see that if I probably should have used Mode 6 to accomplish this as my adjustment was just for 3-4 bins and not all bins.

Once again Tracy has addressed the need in the  Ec2/3 - but, I just failed to understand the function (and conditions) it might have addressed.  Now that Steve has clearly shown there is a high probability that adjusting the staging flow rate will result in more accurate fuel totalizer values and other fuel  factors, I can now see a reason to use mode 6.

Thanks, guys - discussions on this list is generally always educational and helpful

Ed