At a Sunday morning event that was more mock political rally than press conference, General Motors trotted out what seemed like their entire vehicle lineup. The highlight, though, was the car you see here— the much hotter sister of the production-intent Chevy Volt, the Cadillac Converj concept. The coupe would run on the same lithium-ion battery/gas engine combo as the Chevy Volt, a system that General Motors now calls Voltec (which, yes, sounds like the name of a Transformer). It’s an extended-range electric system that drives the car 40 miles on electricity before a small gas engine kicks in to generate backup power. The family resemblance to the production Volt suggests that the Converj incorporates at least some of the aerodynamic lessons-learned that led GM to so dramatically revise the original Volt concept.