SteveT - is it just the one can you're taking with you? innocent
It's all the room I have Roger, what with the spare wheel and two dozen vestal virgin pants..its full!
And it's a small island no? Surely even just one gallon will get me from the ferry to the first petrol station.. I've phoned ahead to make sure they get a delivery in..
It is a small island but you're unlikely to get out of second gear so if I were you I'd ask them to send a spare tanker just incase!

On the plus side SBM won't need any as he'll have overshot the island getting off the ferry.