Following an initial look at the concept stages of the Cadillac ELR, the North American International Auto Show in Detroit was the stage for the car’s official introduction to the world. The ELR is the first luxury electric coupe in GM’s lineup and is based off of the powertrain from the Chevy Volt. Unlike Tesla’s pure-electric Model S sedan, the ELR has a gasoline engine that backs up its battery. The vehicle can travel 35 miles on a single charge of electricity before a 1.4-liter engine comes to life and keeps the coupe running – thanks in large part to a 5.5-foot-long, 435-pound T-shaped battery and an engine that will provide 207 horsepower. The interior of the ELR is a destination unto itself. An open door reveals an exquisite oasis of elegance and information. Finely stitched leather accents, burled-grained wood and available carbon fiber, along with the technology of Cadillac CUE2, provide touches that may even exceed the comforts of home. The automaker has not revealed pricing for the vehicle, which will go on sale in the early weeks of 2014.