It does some weird stuff when you try to use the aux or external fuel tanks. The engines will spool to max but after a few seconds no. 1&2 fuel flow gauges go right to the top and the torque gauges go right to the bottom, and after a few seconds it reverses, and 3&4 does the sane thing, and it will go back and forth until you pull the power down to idle. I hope I'm doing something wrong on the fuel panel. not really a problem it does have enough fuel for a 5+ hour flight, but some of us.....like me.....like to burn all the fuel out of one every now and then :)