Well, SOMONE'S gotta test new luxury cars! 2012 Mercedes-Benz C-Class: 4-Cylinder C 250 Drive Report @GreenCarReports
The author does a nice job not comparing it to other cars but rating the CL250 on its own merits. Nice really. But I will try to ruin that here in the comments. According to the EPA, the C250 is a compact car. There are some other cars in this category that are actually somewhat greener. The Chevy Volt immediately jumps to mind and the price is quite comparable. Also available is the Honda Civic hybrid (just same class as the C250) with an impressive 44/44 mpg. Or you could get a Jetta diesel with an excellent 30/42 mpg. Of course for something larger, there is always the Prius at 51/48 mpg. I know, all too down market. How about the Infiniti M35h at 27/32. hmmm actually only really better in the city, but hey.