That said, there is no way I can every get the economy of my 1.9TD 405 below 40MPG, and it usually gets at least 45, with almost no dual carriageway/m-way work at all. If it gets to stretch it's legs on the "open" road (with modern traffic levels? Hah!) it can often get into the 50's.
My father borrowed it for a little while recently, and managed nearly 60MPG. Why can't I do that?