NOVELTY - The method involves supplying predetermined quantity of hydrogen component and a predetermined quantity of oxygen component, to an internal combustion engine (27), where the predetermined quantity of components are injected under pressure into the internal combustion engine. Automobile is mobilized with power generated from the internal combustion engine. The mobilized vehicle is converted into electrical energy, and the electrical energy is transmitted to an energy system control (4). A portion of the electrical energy is transmitted from an energy system control to an electrolyzer (3).    USE - Method for powering a mobile vehicle e.g. electric or hybrid-electric vehicles, and fuel cell vehicle. Uses include but are not limited to emergency vehicle, military vehicle, truck, trains, semi-trailer or railroad car, and light or medium duty commercial vehicles.    ADVANTAGE - The method optimizes stored energy capacity by cumulative benefits of absorbing and recapturing every minute source of available energy. The method reduces overall energy requirements of the vehicle, thus enabling retrofitting with respect to the existing vehicle. The method eliminates the need for a new hydrogen infrastructure for refueling hydrogen vehicles, thus improving self-fueling characteristics and increasing vehicle efficiency. The method eliminates the need for hydrogen refueling stations and hydrogen transportation in an on-board hydrogen refueling system. The method enhances safety with respect to on-board fuel generation. The method eliminates a repetitive fueling process to remove the chance of fuel leakage due to worn components or human error. The method reduces battery and/or ultra-capacitor size and reduces after-use waste from disposal of chemical batteries and toxic ultracapacitors to reduce ground pollution.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a system for powering a vehicle, comprising a separation device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a retrofit system.    Electrolyzer (3)    Energy system control (4)    Solar covered skin (14)    Internal combustion engine (27)    Grid (40)