Originally Posted by boingingjim
Thanks for the feedback on MPG. I'll be doing a 100mile motorway commute so if 60mpg is achievable that would be great, as previous merc was struggling to get to 40mpg...
520d ED models appear to be averaging about 3mpg better than the standard 520d. But don't be too optimistic for high long term averages. Honest John's Real Life Fuel Economy Register is reporting 48.2mpg, with a spread of 42.2 - 55mpg.
Still brilliant for such a big and heavy car, enjoy!