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FC -
Not sure I understand why you say (For greater efficiency, switch it on when under light engine loads or deceleration fuel cut off and off when under moderate/heavy loads.) is dead wrong, based on the example you provided... You compared AC use during idle (which is no load) while gliding to full load, whereas the recommendation was to use AC under light load (not no load). Did you also compare AC use during light load (e.g. cruising) to AC use under full load?
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