Scott Elson has said that though AI wingmen dont run out of fuel, their performance will be degraded as they get to a LOW FUEL state..but I dont recall the details of that LOW FUEL state. Degraded performance seems to translate to less aggressiveness, less use of AB etc..
Note that wingman's BINGO is set at whatever yours is..Change your BINGO and the wingmen wont call BINGO till they are at that state.