New power plant comes fitted with a stop/start system that now delivers 22 percent better fuel-economy than the previous 6.3 liter unit.

The Mercedes-Benz E63 AMG is the latest AMG model to get the new 5.5 liter bi-turbo V8 replacing the naturally-aspirated 6.3 liter V8.

The M 157 unit produces 386 kW (525 PS / 518 bhp) in its standard configuration but with the AMG Performance Package can be dialed up to 410 kW (557 PS / 550 bhp). Torque is rated at 700 Nm (516 lb-ft) series, 800 Nm (590 lb-ft) with the performance pack.

With high-performance injectors and a stop/start system, the new power plant is good for a 22 percent improvement in fuel-economy over the previous 6.3 liter unit. The E63 sedan is now rated at 9.8 liters/100 km while the wagon comes in at an even 10 liters/100 km.

The AMG SPEEDSHIFT MCT 7-speed sports transmission, with three drive modes - "S" (Sport), "S+" (Sport plus) and "M" (Manual) - also helps keep fuel-economy down while adding a lot of zest to performance.

See the press release below for full details.

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