Recently had a 1LE 3.91 installed on my G8 (before that I was running a 3.45 diff from a Camaro) and I loaded in the new 3.91 gear ratio on the Speedo table and hit commit.
My 4 > 5 shift is now set for 99mph. It was 113mph with the 3.45.
Can I really trust auto scale anymore?