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Has anyone noticed that Av-Gas (Aviation fuel) is half the price of Diesel?, and there is no tax on Av-Gas.

Same here for fuel sold for non-road use. The diesel pumps down at the yards for the pleasure boats are only about two-thirds the price of normal filling stations due to the lower tax.

Similarly, "agricultural" diesel is also much cheaper. It has a red dye added to identify it as fuel which has not had full "road duty" paid on it. Of course, the gummint imposes draconian penalties for using red diesel in a vehicle on a public highway, so nobody around here in farming land would dream of using diesel intended for his tractor in his car. [Linked Image]