It’s significant that an Audi TDI won this year, as Green Car Journal editor and publisher, Ron Cogan said had “the strongest field of nominees ever.” After considering entries from other luxury brands: BMW, Mercedes, Porsche, … In addition to developing electric cars such as the E-tron, a production version of which Audi plans to launch in 2012, the company is working on hybrid concepts. But Audi says they will only be brought to market when the advantages for …