Lahaina shell right? We used to always gas up our boat there... thats actually one of the cheaper stations in the area, or at least it was a few years ago.
I was in the SF Bay area of CA the first week of June and gas was $4.44. Came home to Honolulu at $4.05. Go figure. Maui County has higher gas as the county tax is higher at the pump. Still a pain no matter where you are. I am about ready to build my own still...