While politics, stock market speculation, supply and demand all have an effect on the end result of pricing, the part that I find personally hard to take is the .50 to .60 cents a gallon road tax that everyone pays at the pump at a marina. If you go by AV gas at an airport, if they will sell it to you, either pumped straight into a boat or a container, they are very cautious because they can be fined if it is used on the highway. The diesel at the marinas, is the same diesel used for farm, and for construction implements, dyed red so it can be detected if used in a highway vehicle, why cheaper, no road tax. Again big fines if used on the highway...and caught. If you have a large non trailer-able boat you have to by gas in a marina, no option to put it on the trailer and go save a few dollars. Think of the thousands of gallons pumped into boats every weekend, and the extra cost we pay as consumers, for boats to make our highways better.