Kev, I have 6 x 5 gal cans. I rarely burn 30 gal in a day. (darn opti is just too darn fuel efficient). I go right by WAWA on my way to the boat and pay ~$1.00 less per gal than on the water. I am down around 100 gal right now and I havent used the boat much so I may pull her this week to clean the bottom, fill her up, and maybe take her to de bay on Friday if an offshore trip is out of the question on my dad's boat. (we were to go today but 5-7' seas building to 6-8' and winds 25knots kept the 27 Judge in the stable)
If you must get fuel on the water, go to annapolis landing marina on back creek. Prices are much better