here is the trim, commanded and measured AFR, timing advance and mass air flow in grams/sec on a 2013 Nissan Altima 2.5 with 2800 miles on it.
[URL=http://imageshack.com/i/12t46vj][IMG]http://imageshack.com/a/img38/6920/t46v.jpg[/IMG]
as you can see this is on idle speed at 98C engine temperature, the commanded AFR is just a smidge under ideal, this is to ensure the cat does not cool down.
Under load the figures swing really wildly around to accelerate the car - the factor taken into consideration here is that air is actually heavy and takes time to react and flow into the engine - dumping fuel is to create the "carburettors accelerator pump result" - because it knows that air will follow - it measured this from the MAF and applies the appropriate timing advance which is also dependant on rpm and also will follow the commanded AFR on that variable.
Point is that the ECU does not care about your "performance oriented driving" its primary care is emmissions. - You can also inspect the trims, both about the same - this proves that the ECU is pretty much happy that the engine is in good tune. If anything goes bad on it - the replacement of parts should get this spec back.
