So the car was in for a service the last few days (C-Class Estate, 60 plate) and was lucky enough to get a similar C-Class Estate on a 60 plate as a runaround for a few days. Big and noticeable difference though - Mine = C200 Diesel manual, replacement: C180 CGI Automatic. Fairly comparable I think. My car has done around 17k and replacement 7K. Difference in fuel economoy was considerable! I do a lot of runs up and down the A3 and in my own car I manage arond 47-50 mpg on that run and in the replacement it was more like 33 mpg. Now, I'm not sure if that difference is due simply to mine being an oil burner or due to mine being a manual or maybe even to mine having loosened up a bit more. It may be all 3 but I am inclined to think that the diesel factor might stick a few mpg on there but perhaps the manual element sticks a few more. Am I developing an argument here for manual cars!? Anybody convinced?