I have 42 gals fuel capacity and can cruise at 8gph if I lean slightly rich of peak. I don't like to push my luck as someone who has flown around the Caribbean. I limit my endurance to 4 hours which will give me 60 mins reserve. I cruise at 110kts. So my max "no wind" leg would be 440 nautical miles. Will have to get the charts out and decide if I need to install a ferry tank.
I'm all for the challenge of flying myself.