The 2009 Jetta TDI employs the latest thinking in diesel tech to deliver a powertrain that not only meets 50-state emissions requirements (without a urea-injection system), but also delivers a driving experience that is conventional in every way — except for fuel economy. The new engine is a 2.0-liter with a 16-valve head, producing 140 horsepower and 236 lb-ft of torque. The old TDI’s mechanical injection pump has been ditched in favor of high-pressure, common-rail injection, which eliminates much of the typical diesel clatter. A particulate trap collects the soot that normally spews from the tailpipe, robbing the exhaust of its usual diesel odor. All this is happening now because the U.S. finally has, in significant availability, the kind of ultra-low-sulfur diesel fuel (ULSD) used in Europe.