Syntroleum Corporation (Nasdaq: SYNM) today announced the signing of a fuels testing agreement with Volkswagen of America. The agreement covers testing of synthetic fuels for diesel engines. "We are interested in better understanding the properties and advantages of synthetic fuels," stated Stuart Johnson, Manager, Technical Group, Engineering and Environmental Office for Volkswagen of America. "The tests will be conducted as part of our power train development program to further define the benefits of these fuels relative to our current and future engine designs."