MAF Tuning a dead stock car?

More a curious question than anything.

Is it common place to tune the MAF of a dead stock car? Are the minor dial ins worth it?

I was familiarizing myself with the software on my 09 G8 and I found that when I logged MAF HZ vs STFTs I was seeing a +- 4 or so over a wide range . I did a lengthy log and multiplied % half and saw them come in around +- 2 and in many ares +- 1 or less.

Would that be normal or should my factory tune have been closer than that? (Stock car, Stock Airbox and Clean Paper Filter)

Normal I have seen them off by more than that it changes with the weather and fuel differences

So should it be adjusted or left alone? Or irrelevant as its a small error.

adjust it and add some timing

It will be off in PE, especially since GM rapes the PE tables.