Feb 24, 2011
"The new V8 Coupé from AMG not only undercuts all of its direct competitors in the small but refined four-door high-performance coupé segment, but is also more fuel efficient than significantly lower-powered vehicles."
That may sound a bit smug, but hey, they seem to have a little something to be smug about.

The 2012 CLS 63 AMG is Mercedes’ update to the CLS 55 AMG and the previous CLS AMG 63, both introduced in 2004. Manufacturer’s numbers for the bi-turbo 5.5-liter V8 are 518 HP and 516 lb-ft of torque in the standard version with the optional AMG Performance Package boosting power to 550 HP and 590 lb-ft of torque.
Paired with the AMG 7-speed automatic, this beast does 0-60mph in 4.4 seconds, a slightly quicker 4.3 with the performance package. Top speed in standard form is pegged at 155 mph, rising to 186 mph in the upgrade version.
Mercedes calls it “Affalterbach - Exciting design, ultimate performance and groundbreaking efficiency."

The efficiency is based on a stated 32 percent increase in efficiency over the previous model based on fuel consumption reported at 9.9 litres/100km. Fuel economy may not be top of mind if this is your daily driver, but hey... every little bit helps.
Click here for more info from the manufacturer.