The machine in question re the 4 gallons was an R22 and I was about to fly for over an hour to my destination, half an hour into the flight I would have been back within limits but I still took the 4 gallons out am I being paranoid. I recall in my early days, when being taught, that myself and instructor should only have allowed 20 gallons and there were times we flew on full tanks (30GALLONS). When I had enough knowledge to question it, he said he was lighter than he looked but it never happened again after that.