Our colleagues from Automobile Magazine have managed to find out that the 2015 Mercedes-AMG GT will also be offered in a 462 horsepower version. As you already know, the upcoming Stuttgart-based supercar will come with a twin-turbo V8 4.0 liter unit rated at 510 horsepower and 650 Nm peak of torque. 
On the outside, the 2015 Mercedes-AMG GT will feature 19 inch alloy wheels wrapped in Michelin Pilot Super Sport tires. The entry-level version will have a limited-slip differential, while the S variant will have an E-diff. 
The 2015 Mercedes-AMG GT-S will sprint from stand still to 100 km/h in less than 3.9 seconds, and will have a top speed of 312 km/h. More than that, the German supercar will be able to return 9.3 liters per 100 kilometers. 

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As you probably know, the 2015 Mercedes-AMG GT will be officially showcased in October at the 2014 Paris Motor Show.

Source: Automobile Magazine