Interesting. Cause in my tests, fuel at 50 percent will always make the plane move at idle (zero) throttle and 930 rpm. I forgot to mention that for passengers, I left it at default too, which is: two pilots in the front, each weighing 170 lbs. Did you do your test with the same simulator default pax count and weight configuration or did you change them to something higher?
And watching this video from Pete, I get the impression that one isn’t supposed to keep the engines idling at anything less than 1000 rpm when on the ground? He’s idling at something like 1000-1100 rpm with brakes set to on, and after he gets permission to taxi, it seems like he simply releases the parking brake and the plane starts to move forward on its own without him having to increase the rpm/throttle at all. He’s flying with full tanks too:
