I only have a 8 gal tank on my boat and I always carry spare gallon cans of red when going across channel in case there is no wind and I need to fill up enroute (70+ miles). Suffice to say there are times when I don't use the fuel going across and I have the cans full on arrival. I keep the receipts in case questioned as the fuel has been purchesed for the specific use. Never had any problems so far.