Assuming 8 adults, 2 crew and 30 lbs a piece loaded in the aft, with 50 lbs of stuff in the lockers, and minimum IFR reserves with no alternate.
2300 lb burn makes min fuel roughly 2800 lbs no alternate.
With the pax load as mentioned that puts you just under 15000 and at the aft limit. Even with kids on board, if loaded wrong you could be outside the aft limit. That’s also assuming 2 crew and 8 pax. Put a 9th passenger on the lav and take away the SIC and it gets worse quick.
That burn is at 31000 ft normal cruise, assuming RVSM capable. Also across the gulf, if equipped with a raft.
Of course that’s as ours are equipped, with stock and a raft.