i currently own a 05 c230k its actually faster than the 06 model and fuel economy is good on a good day on the freeway cruise is on i can reach 33 to 35 mpg the inside is very slick on design you can find features that can hardly be seen in any other car plus its quick on take off the car never hesitate and also the sport and comfort mode if you have a heavy right foot then sport is what u use but gas wise use the comfort mode you can bearely hear the engine even at redline