Motorboat engines run on gasoline or diesel fuel. Diesel is less flammable than gasoline / petrol. MTBE is used as a fuel component in fuel for gasoline engines. Propane combustion is much cleaner than that of coal or unleaded gasoline. It could run on either gasoline or compressed natural gas. Diesel engines are generally heavier, noisier, and more powerful at lower speeds than gasoline engines. With cars, the tax is different for gasoline and diesel engines. Octane is a component of gasoline (petrol). Small quantities occur in gasoline and aircraft fuels. Bromine was used for an additive for gasoline and other fuels. "n"-Heptane is one of the components of gasoline (petrol). They compared efficiency of E10, E85, and ethanol with gasoline. Production of gasoline fueled cars peaked in 2017. Special emphasis was put on gasoline and oil supplies. Both engines come from the new GM Small Gasoline Engine family.