As a clarification - Closed Loop looks at the actual A/F ratio (wideband O2 feedback) and makes minor real-time temporary adjustments to achieve the target A/F ratio for the current engine conditions (RPM, vacuum, TPS position, etc.). These are short term real-time adjustments that do not change the base fuel table. “Learning” is a phrase that is being used when the software looks at the history of short term closed loop adjustments and actually changes the base fuel table over a longer period of time.