VE tables vary from year to year, osid to osid, GT/GTP... There is no "rhyme or reason" to their selection either.
and also, "making a difference" is quite opinionated, if your air fuel is wrong, its wrong.. if its right its right... a narrowband is not going to offer even a small glimpse of these 'differences" and a wideband would struggle even more to see these.
There are alot of different ideas about why the world is going to end next week, does it make the my prediction of "the world isnt going to end" wrong?There's a lot of different ideas about VE