Did you know that the next generation of diesel-powered cars and SUVs is 98 percent cleaner than diesels sold just two years ago? Did you know these new clean diesels offer 23 to 43 percent better fuel economy than the same vehicle with a gasoline engine? And finally, did you know this new generation of clean diesel-powered vehicles offers efficiency matching that of gas-electric hybrids? Unfortunately for Volkswagen, you probably answered no to each of these questions. But the German automaker is hoping to increase clean-diesel awareness, and it’s starting with the 2009 Jetta TDI. It’s legal in all 50 states, gets more than 40 mpg and starts at less than $22,000.