By the time we actually see the 
McLaren P1 in the carbon fiber next week, there won't be many details 
left not already announced by the British supercar maker. Today, McLaren
 leaked out the power and engine specs of its new supercar, announcing 
the P1 would offer 903 hp thanks to a combination of a twin-turbo 
3.8-liter V-6 and a massive battery pack that can be charged from the 
outside — making it the world's fastest plug-in hybrid.
McLaren says the 3.8 liter V-6 will churn out 787 hp on its own, 
while the electric motor and battery pack add an additional 176 hp, all 
of which routes through the 7-speed dual-clutch transmission to the rear
 wheels. The battery pack, which adds a surprisingly small 211 lbs of 
weight to the P1, allows the car to drive 6 miles on electricity alone —
 and if depleted, can be charged from an outlet. To make the connection 
with its Formula 1 machines, McLaren says the P1 will come with an 
F1-like electric boost dubbed the Instant Power Assist System, a button 
on the steering wheel that commands the electric motor to provide all of
 its power instantly.
All this in a car that McLaren 
suggests could get about 25 mpg in everyday driving. Which is the real 
point of all this electric technology: McLaren and other supercar makers
 aren't immune from tough fuel economy rules in Europe, the United 
States and Asia, and adding a dash of green-ish technology appeals to 
the billionaires who can afford the P1, the upcoming Ferrari Enzo 
successor and Porsche's hybrid 918. As the P1 shows, top speeds alone 
are no longer sufficient to make a supercar super.
Source :http://autos.yahoo.com/
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