[olddog]

Dwight, I think he was meaning that the WOT setting is 12.5, which is spot on. Under all other conditions, the AFR is table, based on load and rpm. Other tables add in or take away based on engine temp, maybe egr and air temp. So, there is no one afr under part throttle conditions. The ford map goes from 10 to 18, if memory serves. When decelerating the afr goes very lean.

Cruising the afr will typically target 14.7 and let the O2 trim it.