NOVELTY - Fuel efficiency of an internal combustion engine or the cutting or welding efficiency of a welding system is increased by providing an electrolyzer comprising electrolysis chamber, aqueous electrolyte solution, 2 principal electrodes, and supplemental electrode; applying electrical potential between the 2 principal electrodes; and providing way for delivery of combustible gas to its end use.    USE - For increasing the fuel efficiency of an internal combustion engine or the cutting or welding efficiency of a welding system.    ADVANTAGE - The method makes use of improved electrolyzer. With the use of only 4 Kwh, the electrolyzer rapidly converts water into 55 standard cubic feet of hydrogen-hydrogen-oxygen (HHO) gas at 35 psi. The electrolyzer produces a new form of water which is gaseous and combustible. The HHO gas exhibits widely varying energy content, and does not require any oxygen for its combustion since it contains in its interior all oxygen needed for that scope.    DETAILED DESCRIPTION - Increasing the fuel efficiency of an internal combustion engine or the cutting or welding efficiency of a welding system, comprises:    (A) providing an electrolyzer comprising an electrolysis chamber, an aqueous electrolyte solution comprising water, and partially filling the electrolysis chamber such that a gas reservoir region is formed above the aqueous electrolyte solution, 2 principal electrodes comprising an anode electrode and a cathode electrode, the principal electrodes partially immersed in the aqueous electrolyte solution, and supplemental electrode partially immersed in the aqueous electrolyte solution and interposed between 2 principle electrodes that are not connected to the anode or cathode with a metallic conductor, in which the 2 principal electrodes and the supplemental electrode(s) is held in a fixed spatial relationship;    (B) applying electrical potential between the 2 principal electrodes, in which a combustible gas is produced, which is comprised of clusters of hydrogen and oxygen atoms structured according to formula HmOn, and the combustible gas has a varying energy content depending on its use; and    (C) providing way for delivery of the combustible gas to its end use.    m, n=have null or positive integer values with the exception that m and n can not be 0 at the same time.    DESCRIPTION OF DRAWING(S) - The figure is a view of a new chemical species consisting of two dimers H-O of water molecule in their polarized form as occurring in the water molecule.