After my very favourable C310 flying, and getting happily use to managing six fuel tanks, a friend and I ferried a Cessna 303 eastbound across the Atlantic via Greenland and Iceland. The trip was within the aircraft's internal fuel range capability, with appropriate alternates. But, it is still un-nerving having only two tanks (left and right), and seeing the quantity indicators bouncing between 1/4 and empty, and not seeing Iceland yet! I would rather have had four empty, and two surely indicating more than half full!