Actually Frank, the Chevy
Actually Frank, the Chevy Volt engine does in fact put power to the ground in some instances.. Not to get you on a technicality...it's actually pretty cool how it works. But the Volt is not a 100% electrically propelled vehicle.
http://www.motortrend.com/features/editorial/1010_unbolting_the_chevy_volt_to_see_how_it_ticks/