I have a 1.6 TDI CR Leon and on my drive to work I can average almost 60mpg, and that's not 100% sensible driving either plus it's through the city where I don't get over 40mph and the engine has barely got to 90c by the time I finish. On the flat at 60mph in 5th (eg motorway or A road dual carriageway) the instant consumption normally sits around 3 figures.