Let me set the Wayback machine to 2010 for a moment.
Excitement then around electric cars and plug-in hybrid electric cars was running high. The Toyota Prius had revolutionized the way Americans thought about fuel economy.
But the original Prius design didn't involve all-electric operation. So the next logical step in the the evolution of the automobile was a different type of hybrid gas-electric design.
The Prius' parallel-hybrid powertrain, with gas and electric motors running at the same time, would be supplanted by a serial hybrid design, with an electric motor delivering about 40 miles of range before depleting its batteries, at which point, a small gas engine would kick in to generate more electricity.