I have the pleasure of a B class 180CDI auto as a loan car for a couple of days. Having just done the same journey to work with cruise set @ 75MPH I managed to achieve 46MPG. The same journey in my car W212 350CDI same speed 42MPG, I was expecting a lot better from the B class. Quite shocked really. Plus I'd much rather be in the E than the B much to like driving a van and noisy for my taste.