I've had a Volt for a few years now. I will say I generally drive it in gas mode. It only has a 40 mile electric range. The later ones had a 60 mile range (?). I would think the gas motor selected was not ideal as a generator. Still, the 40 to 60 miles range would be usable for say 80% of peoples needs. The Bolt has a 250 mile range.
I would say a fuel cell Plug In Electric Hybrid (PHEV) would be interesting. I think a 100 mile electric range would be good.