Abstract: Systems and methods create an air-gas mixture supply for an endothermic generator. The systems and methods convey a hydrocarbon gas under pressure through a valve, to thereby form an air-gas mixture supply for the endothermic generator. The systems and methods sense an actual air-gas ratio of the air-gas mixture supply. The systems and methods receive from an operator a set point air-gas ratio. The systems and methods compare the actual value to the set point value and generate a deviation. The systems and methods generating a control signal to operate the valve based upon the deviation, and, preferably, to minimize the deviation.