The Porsche 918 Spyder concept combines high-tech racing features with electric-mobility to offer a fascinating range of qualities. For example, it is planned to provide an emission level of just 70 grams of CO2 per kilometer on fuel consumption of only three liters/100 kilometers (equal to approximately 78 mpg U.S.), which is truly outstanding, even for an ultra-compact city car. This car, however, is intended to offer the performance of a super sports car with acceleration from a standstill to 100 km/h in just under 3.2 seconds, top speed of 320 km/h (198 mph), and a lap time on the Nordschleife of Nurburgring in less than 7:30 minutes, faster than even the Porsche Carrera GT.
Parallel full hybrid; 4.6-liter V8 mid-engine with dry-sump lubrication; hybrid module with electric motor and decoupler; electric motor with decoupler and gear unit on front axle; auto start/stop function; electrical system recuperation; four cooling circuits for motors, transmission and battery; thermal management.
BUT
Running on the electric motor only gives you a range of 18 miles.
http://press.porsche.com/news/release.php?id=787
Oh what's the price you ask- in this case if you have to ask you cannot afford it-
$845,000
Would be nice though.