I flew the 404 in africa and also found it a great work horse and a pleasure to fly. A gentle touch and some thought into every throttle movement is essential to keep that engine plowing on. As for performance charts, well the thing got off the ground nicely at max all up weights from dirt strips at 5500' elevation. Used less runway than a cessna caravan at that altitude for take off. Landing was another issue. Not the best brakes especially on downhill runways with a heavy aircraft.
if you are looking for single eng performance I know of 2 aircraft that have lost an engine after take off at max weight (probably more) and managed to make it back. It was at sea level, didn't climb but didn't descend either.
