appreciate your comments jcat...but unless I find the car does "wonder", it does not now, I will leave alignment as is. I also defer to the tire pressure of 30 psi as stated on door label. That has worked well for the 20+ years regardless of tire brand that I have had the car.
There have been several threads on this and other Impala forums (GRAIL) posting "improved" alignment specs vs GM's published ones. They basically are "within" the same ones as published...just not as much +/- tolerance.
If I do find these particular settings pose drivability or tire wear issues I will have shop re-visit the alignment
Of the 3 tire brands I have had previous to these Nittos (BFG, Bridgestone Potenza, KUMO) the Kumo was my least favorite in terms of traction and tire wear. I have no problem spinning tires and the Kumos were more prone to that than the others. Have not driven the Nittos enough to form an opinion vs the other brands yet. With that said, just like NASCAR throwing on new tires after 20 laps, these "new" tires certainly appear to have more grip that my old worn Kumos...as any new tire should.
As far as 1/4 mi, I run a MT ET Street on a custom 15" rim....:-)
\'96 BBB 383/T-56