What are your thoughts on diesel vs petrol power delivery (test drive an S5 and RS5)

Looks like there will be a new 2.0TDI Biturbo in the next Passat. (Sorry can't link from this phone.)
 
Interesting... Although there's no way I'd fit in the artist's interpretation of that car!
 
The 2.0L engine should be lighter and more economical. The new chassis is estimated to be 85kg lighter. We will have to wait and see how the power-to-weight ratios compare.