Hello, I have just purchased 2006 E280 CDI with full merc service history and 25k miles and am really pleased with it. My mate has also just bought a 55 plate E320 CDI. What seems strange is he seems to get 40 mpg all day even running around town. My 280 is not bad on a motorway run where I can see around 40 to 42 mpg but most of the time its does around 32 around town. Can anyone advise me what sort of MPG should I be seeing on my E280 and does switching the gearbox to C mode make any difference etc, any advice would be great. thanks