Auto and bus makers around the world face the daunting task of making their vehicles more fuel-efficient. Better fuel efficiency and emissions reduction are being mandated by regulatory authorities and are powerful market drivers for TEGs in this market segment. As a result, there has been a surge of interest in using waste heat recovery from thermoelectrics in transportation. Currently, heat from the exhaust system of a car , truck or bus is useless as it is discharged into the environment. Thermoelectric Generators (TEGs) can convert some of this wasted heat into useful electricity. Integrating TEGs into buses improves gas mileage and reduces carbon dioxide and other greenhouse gas emissions. Consequently, nearly all automobile manufacturers are working to add TEGs into their cars and buses within the next few years.