The Porsche 918 Spyder's the sexiest hybrid concept out there, offering Carrera GT-like performance and some high, mostly made-up fuel economy number you stop caring about as soon as you hear the 3.4-liter V8 rumble.
There's a lot we don't know about the hybrid Porsche 918 Spyder concept. Is its 500 HP combined or gas-only? Does performance really tail-off as charge runs down? So what do we know? Porsche might actually build this.
The plug-in hybrid Porsche 918 Spyder supposedly makes over 500 HP and returns 78 MPG thanks to a 3.4-liter V8 and three electric motors. We're guessing that's been figured the same way as the Chevy Volt's 230 MPG fuel economy.