Honda Insight, Mercury Milan Hybrid , Toyota Prius, and Volkswagen Golf TDI were the final opponents of Audi A3 TDI. The winner of this year was unveiled at a press conference at the Los Angeles Auto Show. “The Audi A3 TDI is an exceptional vehicle that ‘ green car ‘ enthusiasts would be proud to drive,” says Ron Cogan, editor and publisher of the Green Car Journal and editor of GreenCar.com. “Without exotic technology or special measures, it achieves lower CO2 greenhouse …