Honestly can't remember the last time I flew with more than two -65s, every time I have done so it's left me feeling all dirty.
With 2x -65s, 4x GBU/Mk-82, rockets and 30mm a flight of 4 aircraft can destroy (using a conservative estimate) around 40 armoured targets. Beyond a fulda gap scenario I really can't see any occasion you'd need to carry 6 Mavs, or even 4 for that matter.
Most missions I fly, even in a 2-ship flight one or both aircraft normally bring stores back home. With a realistic mission, there just won't be that many targets out there (at least not that you will be able to find), so you'll regularly end up heading home low on fuel long before you run out of ordnance.
_________________________
Eddie