because I like the TDI's but I don't like their build quality. BMW's engineering + Diesel == high MPG in a great ride.
The reason for my interest is that in my day job I design engines, mainly diesel engines and our perception in Europe is that you guys in the states are not interested in diesels, particularly not for economy as your fuel is so cheap.
But that is obviously not entirely true.
All the best
Gareth
