without having either of
without having either of these cars on the "road" yet its not easy to say. I would speculate that the range advertised by both companies will be the EPA rating. Would not expect GM to offer battery options. Being the former owner of a Nissan Leaf and the current owner of a 2016 Volt I would say GM has a tendency to under advertise and over deliver. Our Volt usually delivers 70 miles on a charge. Recent A/C usage has cut in to that a bit.