Matthew Welch, GM of Auburn VW believes in his New Jetta TDI so much that he's accepted the challenge of pitting his car against the Toyota Prius for fuel economy supremacy. He and a film crew will fill the tanks of both a New Volkswagen Jetta TDI and the Toyota Prius in Auburn Washington. They'll attempt to drive them both to San Francisco without stopping at a single gas station to fill up, all under the watchful eye of the film crew documenting everything. Which one will make the whole journey? Will either of them even make it?