Polls apart from its gas guzzling models of the 60's and 70's, Cadillac has shown how it see's the future of sports coupes with the Converj Concept, at the North American International Auto Show. The Converj uses the Chevrolet Volt's electric propulsion technology, to allow it to travel up to 40 miles without using petrol or making any harmful emissions. The car also utilises some advance energy recovery technology as well as solar roof panels.