Hi, thanks for the great aircraft. I did a short hop today, after takeoff I had to leave for dinner. I pressed ESC to enter menu and got my dinner. After coming back, my tanks were close too empty, as the aircraft burned fuel since it was paused. 
normal behavior or bug?

another thing I realized: on the next flight I forgot to set the CG in the MCDU. And the aircraft used a lot more fuel then the simbrief profile (from FAQ) calculated. I understand that without the CG the aircraft can’t use the trim tank, but has it that big impact? It used approx 1 t more on a 45 min flight. 
thanks

Yup, that does sound like a bug and I can reproduce this. Thanks for reporting! 🙂