A digital broadcast receiving system and a method for controlling the same are disclosed. Electromagnetic waves in one or more desired frequency ranges, including terahertz, infrared, or visible light, can be generated using the ring-down mode of a splint-ring resonator. In addition, the computer receives first fuel level data and second fuel level data of the vehicle that identifies a quantity of fuel present in a fuel tank of the vehicle prior to a fuel purchase event and after a fuel purchase event respectively.