B E N
FRF Addict
The stoich number is usually already 14.08 (for E10) from Ford because that is what pump fuel is in the US.
I haven't been in the ford ECU for a while, but that point further proves my point of the truck comes tuned for E10, and then the existing tuning is also (very likely) for E10.
You are correct, this screenshot is from a stock 14'