NOVELTY - Dual utilization liquid and gaseous fuel reformer (400) comprises: liquid fuel gas phase reforming reaction zone; a gaseous fuel gas phase reforming reaction zone; gas flow conduit (404) comprising an oxygen-containing gas inlet, liquid fuel inlet, gaseous fuel inlet, and gaseous fuel reforming reaction mixture inlet, first heating zone (405), second heating zone, liquid fuel vaporizer and gaseous reforming reaction mixture outlet; gaseous reforming reaction mixture igniter system in thermal communication with liquid and gaseous fuel reaction zones; and a hydrogen-rich reformate outlet.    USE - The device is useful for catalytic partial oxidation reforming (claimed) liquid and gaseous fuels to produce hydrogen-rich reformates, and for steam reforming or autothermal reforming.    ADVANTAGE - The device: provides selective reforming of liquid and gaseous fuels, where the various liquid reactants can be delivered through the liquid delivery part of the system and various gaseous reactants can be delivered through the gas delivery part; is flexible so that it can be operated as mobile or portable reformer; and is capable of reforming gaseous fuels at cold start-up mode or low heat conditions.    DETAILED DESCRIPTION - Dual utilization liquid and gaseous fuel reformer (400) comprises: liquid fuel gas phase reforming reaction zone; a gaseous fuel gas phase reforming reaction zone; a gas flow conduit (404) comprising an oxygen-containing gas inlet, a liquid fuel inlet positioned downstream from the oxygen-containing gas inlet, a gaseous fuel inlet positioned downstream from the oxygen-containing gas inlet or oxygen-containing gas and gaseous fuel reforming reaction mixture inlet positioned downstream from the oxygen-containing gas inlet, a first heating zone (405) thermally coupled to a first heater (406) and positioned downstream from the oxygen-containing gas inlet, a second heating zone thermally coupled to an internal and/or external source of heat and positioned downstream from the oxygen-containing gas inlet, a liquid fuel vaporizer and a gaseous reforming reaction mixture outlet in gas-flow communication with the liquid fuel and gaseous fuel reforming reaction zones; a gaseous reforming reaction mixture igniter system in thermal communication with each of the liquid and gaseous fuel reforming reaction zones; and a hydrogen-rich reformate outlet in fluid communication with the liquid fuel gas phase reforming reaction zone. An INDEPENDENT CLAIM is also included for method of reforming comprising (a) reforming first gaseous reforming reaction mixture comprising oxygen-containing gas and vaporized liquid fuel within the first or common reforming reaction zone to produce hydrogen-rich reformate, (b) before or after step (a), reforming second gaseous reforming reaction mixture comprising oxygen-containing gas and gaseous fuel within the second or common reforming reaction zone to produce hydrogen-rich reformate, and (c) transitioning from step (a) to step (b) so that heat recovered from step (a), with or without additional heat, is utilized to initiate step (b), or transitioning from step (b) to reform step (a) so that heat recovered from step (b), with or without additional heat, is utilized to vaporize liquid fuel and heat the second or common reforming reaction zone before, the start of step (a).    DESCRIPTION OF DRAWING(S) - The figure illustrates a longitudinal cross-sectional view of the dual utilization gaseous and liquid fuel reformer.    Reformer (400)    Conduit (404)    First heating zone (406) First heater (405)    Second heater (413)