There is a work-around if you so decide to choose. When I'm making a mission and it includes wing-men or ENY AI aircraft, at the very first way-point I set the aircraft options in the advanced way-point editor to "afterburner off." That way the flight does not use afterburner flying around until I tell it they can.
How do I do this? At another way-point, one closer to the AO, I set the advanced way-point options back to "afterburner on." That way they do not waste fuel in afterburner until needed in the combat area.
You could also set this as a radio trigger for your own flight if desired or that of the ENY. The tool/option is there to help alleviate the problems with the AI managing its own fuel consumption.
Hope this helps.