Does MUC have a drive through de-icing rig; is it a remote de-icing area with manned spray hoses or is it at the gate? I doubt the latter at this newish extravagant airport. With the forecast temps you would expect to de-ice, so include that in the plan. Thus that cost is already a given so tanker max to save fuel cost. What tankering does do for you, if you can land with return fuel, is it reduces one more outside agency that could delay your departure in the early morning 1st wave. Some airports do not allow fueling & boarding at the same time. Load the pax and go the de-ice area snell. Everyone else will be clamouring for fuel & de-icing. The sooner you can get in the de-ice queue the better.