The normal non CGI 3.5 V6 is very economical, i manage to get 12.1km/100 km (sorry no idea how to convert this to mpg) with air con on in the E class, so i am not surprised the CLS has great mpg.

I have read a few articles on MB's air suspension, and i have tried it out in my friend's S class. It does make a difference, the ride is a tiny bit harder, and the body control does improve, but not as much as i was hoping for.

Air leaks does occur in these suspensions, espically when the seal wears out over time. I saw a E 500 with it is left rear corner sagging down badly inside a carpark.