You can save on gasoline and still go 210 miles an hour — if you're willing to pay $1.3 million. That's the price tag for the La Ferrari, a new hyper-hybrid that sold out at this week's auto show in Geneva. It's not just Ferrari. Porsche and the Formula 1-maker McLaren are going hyper-hybrid as well, as we hear from Dan Neil, auto critic for the Wall Street Journal.