To sum up what we have discussed about the differences and similarities between gasoline and diesel fuel and ethanol, they are aii DOT Class3 Flammable Liquids. Gasoline and diesel fuel are nonpolar mixtures that are immiscible with water. Ethanol is a pure chemical that is polar and miscible with water. In transportation, you will likely encounter larger quantities in an accident because ethanol is largely shipped by rail. Once a fire has occurred in an accident at a plant or in storage or transportation, you need to use the proper type of foam in order to extinguish the fire.