Got a 2ltr Blue HDI gt-line SW last week, just over a year old. I love everything about it and much prefer it to my Audi A5 Coupe 3 ltr TDI in just about every respect apart from the obvious power. Trouble is, I keep reading I should be getting around 78 mpg and although I never believe mileage claims, the best I have had is 47mpg on a long run. My Audi gave me 45 on the same run. Is this about right ?