Windy City Times (Enlarge photo)

26/06/2008 09:57. The heart of the Hybrid drivetrain was co-developed with GM and BMW, so the performance and functionality of the Hybrid system shouldn't be much different than the one in the GMC Yukon Hybrid we drove recently. It will offer an average of 20 percent improvement in fuel economy, with the majority of improvement coming in city driving. // Windy City Times