YKA
Pre-takeoff checklist
I am not the one who you quoted....that would be JOhnH. I just jumped in to clarify with a bit of math.
Go look earlier in the thread. He said "800NM (1,600RT)" as you quoted. OP shows a commercial flight at $485 round trip. JOhnH is saying a comparable round trip in this Bonanza would be $675 in fuel alone.
Sorry about that.