What exactly did he push Mr Webmaster?

 

https://www.ford-trucks.com/guidelines.html

 

Its called Datalogging. I do the same thing for EFI Harley Davidsons.

 

Data logging on factory O2 sensors is no substitute for wide band O2 if someone is touting their tunes as superior because of a/f ratios. If the factory parts were accurate you wouldn't see the deviations that exist in the real world.