NOVELTY - The assembly has a fuel tank holding liquid fuel (20) at ambient pressure, and a water tank for holding water (25). A reformation system (40) reacts the water from the water tank with the liquid fuel from the fuel tank to produce hydrogen gas and exhaust gas. A hydrogen separator (64) separates the hydrogen gas from the exhaust gas to obtain purified hydrogen gas, where some of the purified hydrogen gas is supplied to a proton exchange membrane (PEM) fuel cell (12) and burned to directly heat the reformation system. Electric motors drive wheels, where each motor is powered by the fuel cell.    USE - Automobile assembly.    ADVANTAGE - The vehicle is refueled by filling the fuel tank with the liquid fuel at ordinary gas stations such that no infrastructure changes are required to manufacture, store and transport the hydrogen gas to a refueling station, so that the vehicle can be driven and refueled without any changes to existing systems for supplying the liquid fuel to the gas stations. The hydrogen gas can be produced from different types of liquid fuel such that an owner of the vehicle can fill the gas tank with the fuel in a cost-effective manner. The water tank is provided with a refill port that is preferably located under a bonnet of the vehicle in an event in-which the water tank runs low on the water so as to prevent the user from inadvertently mistaking the water tank refill port with a gas tank fill port. The assembly allows an injector to inject the water at controlled rate into hot exhaust gas of the vehicle such that surplus water is vented as vapor in a vehicle exhaust, thus preventing the expelled water from puddling under the vehicle.    DETAILED DESCRIPTION - The liquid fuel is hydrocarbon based liquid fuel e.g. low octane petrol, high-octane petrol, diesel fuel and ethanol. An INDEPENDENT CLAIM is also included for a system for generating hydrogen gas on-demand within a vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a structure illustrating operation of a fuel reformation system and hydrogen gas flow used within a vehicle.    PEM fuel cell (12)    Liquid fuel (20)    Water (25)    Reformation system (40)    Hydrogen separator (64)