The Volt is an EREV, the PHEV
The Volt is an EREV, the PHEV Prius is not. It's not GM trying to muddy things up, it is the Federal Government and I think it is a useful clarification: H-EV Vehicles are certified using the US06 drive cycle, or FTP (Federal Test Procedure). If a vehicle can complete the US06 drive cycle as an EV then it is an EV, but of course an EV with a range extender needs to be differentiated from a BEV (don't you agree?). The Volt can do the US06 cycle as an EV, the Prius PHEV cannot. Case closed. As far as the Government is concerned, based upon its FTP, the Volt is NOT a hybrid, the Prius and others of its ilk are. As for confusion, I have been making presentations about these technologies to the public for years and have found that once all this is explained, most people get it.