2014-15 vs 2016+ Corvette LT1 cranking Eq Ratio

[DobermanRacing]

Why do the 2014-15 LT1 Corvettes have such a big difference in their cranking eq ratios?

My 2015 C7 M7 Z51
Screenshot 2024-04-30 155417.png

2016 C7 M7 stock file from Evan's Performance Academy
Screenshot 2024-04-30 155437.png

[96GS007]

Doesn't look like the 2016 file is actually stock or it's a one-off. My 2019 file matches the 2015 values.
Screenshot 2024-04-30 152835.jpg

[DobermanRacing]

Doesn't look like the 2016 file is actually stock or it's a one-off. My 2019 file matches the 2015 values.
Screenshot 2024-04-30 152835.jpg

I download stock tune files from the tune repository for 2016-2018. The 2016-2017 files match the one above from Evan's. 2017 was an auto everything else is M7. The 2018 match our files.

I wonder why 2016 and 2017 are different.

[96GS007]

I download stock tune files from the tune repository for 2016-2018. The 2016-2017 files match the one above from Evan's. 2017 was an auto everything else is M7. The 2018 match our files.

I wonder why 2016 and 2017 are different.

I tried looking around and I go nothin' Sometimes GM is mysterious and changes things seemingly for the sake of change

[TriPinTaZ]

these kinds of changes are probably emissions related