At long, long last, General Motors has revealed the follow-up vehicle to the plug-in Chevrolet Volt. Based on the original Converj concept, the Cadillac ELR had been an on-and-off again project for the automaker. Now it's not only a reality, it's frickin' gorgeous. A sleek two-door coupe, the ELR shares the Voltec powertrain technology employed on the Volt, delivering roughly 35 miles of all-electric range before a supplemental 1.4L gasoline engine kicks in for a total driving range of approximately 300 miles, all of which can be done in the carpool lane in certain states that provide the coveted incentive to plug-in cars.