Hi Old Smokey,
thanks a lot for reply. As high altitude flying in the German IDS version is concerned, it is painful. Even with variable wing sweep the engine performance and response is marginal above FL 250. It is great to fly at low level but we try to avoid IFR flying above FL 280. I flew the good old Phantom before and with its J 79 engines it behaved in FL 370 like the Tornado in FL 280. High level (Fl 250+) air-to-air refueling in the Tornado, for example, is no fun.