Im not sure I understand the point, but I know this:
The last two gear changes I made on two different cars (from 4.56 to 3.91, bbm, and from 5.14 to 4.57, n/a small block) the cars ran virtually the same et and mph.
Both cars had plenty of stall speed, that might have been a mitigating factor.
But I'm still changing my current car from 3.50 to 4.10.
I'm just trying to show this one aspect of gear ratio ain't linear if we use 2.76 and 5.13 as book ends going from 2.76 to 3.55 (0.79:1 gain) gets you 50% there mph per rpms, and going to 5.13 from 3.55 (1.58:1 gain) only gives you the other 50%.