On Wed, 6 Jun 2007 11:42:36 -0300, wrote:

What would be the best way to carry extra fuel?

The best way is find a place on the boat to install a secondary fuel
tank. That said, many cruisers carry jerry jugs on deck, sometimes
near the stern, sometimes lashed to a board between lifeline
stanchions.

My advice? Buy a boat with more fuel capacity. 20 gallons is totally
inadequate for extended cruising.