Picked up my new C350 CDI estate on 1st September and have to say I'm gobsmacked by the fuel economy. Did an over 400 mile round trip from Essex to Wiltshire at the weekend and got 47.9 mpg. That's seems un believable from a 3.0 V6 Deisel. Even when I've had my foot planted around the local lanes I'm getting mid 30's.