Not realty true The Volt can just run on its generator if you need it to. That way if you run out of EV miles it will just start up and still get you home.
2014 Volt: Electric Car - Hybrid Car | Chevrolet
The Volt is very prime time and the future is now.
Today my wife drove 80 miles and 4 of them were using gas. We did not have time to get a complete charge for the second run because she had other places to go. But no problem the generator just took over.