Geoff
If you are considering a J230 (I will not enter the engine debate - too many preconceived opinions here for me)
Just consider, although the tanks can hold 135ltrs for one up flying, at 80ltrs you still have over 3 hrs endurance at 120kts, or 2nm per minute. Like any aircraft you are fuel limited by weight to stay legal, in all classes be it RAA, GA, or RPT.
If you are interested in a personal opinion, feel free to PM me.