Well, one could consider that a fail on my part - I read it here first:
http://jalopnik.com/5692547/amg-stur...0+hp-cls63-amg
Specifically: AMG chief Ola Källenius says despite the power boost, the CLS63 AMG will get a combined 24 mpg in everyday driving, and hit some 33 mpg on the highway. Part of that increase also comes from the 7-speed DCT transmission, with four separate modes, including a manual stage that Källenius says is a perfect mimic of a true hand stirrer.
I must say, Mercedes extremely underrates their high performance vehicles - time and time again Mercedes owner's toss them on the dyno and the rwhp and rwtq is way too close to the advertised flywheel HP and TQ.
I'm on my 9th benz and I have always gotten anywhere from 2 to 9 more mpg than the advertised figures..... but I cannot dispute the manufacture's "official" position
Well, time will tell and maybe I can get my hands on one.