Actually just had a major player in the tuning world for DECADES.
Just load one of our stock files, log with his very calibrated equipment.
And said... "I not touching this file, this is spot on for a DI car, well done"
Nice pat on the back today.
At least they used SAE which is correct.
Normally you see them in STD which would have resulted in higher #'s.
Why?
That looks like a typical reading for a wideband shoved in the tail pipe.
That is the 100% incorrect way of reading air fuel on a DI car.
You will get a leaner than normal reading
And these cars hate being rich. (for reasons I have listed before)
The LT1 is NOT and LS1, LS3, LS3, L99, LQ9.
Your is within 5% of what it should be running at...
And that tiny percent I can almost guaranty is two things.
1) the wide band is in the tailpipe
2) sensor error.
NOTE: We use lab grade air fuel, and 5 gas analyzers here. Calibrated DAILY. We don't mess with air-fuel errors. We don't have the luxury since we have to do LV3 emissions testing.