I just studied some of the models on the UK website and converted the mpg numbers from UK to US gallons. Here are the results.

200 CDI (4 cyl) 29/53
220 CDI (4 cyl) 27/48
270 CDI (5 cyl) 26/47
320 CDI (6 cyl) 26/44

OK so no one claimed getting over 50 mpg on a 6 cyl so I take it back. But even the 44 mpg on the 320CDI seems wishful to me. I had a Civic Hybrid for a year which was rated at 42/51 but my mostly highway driving resulted in 44 mpg on average. That's why I'm skeptical of these numbers, especially the massive difference between city and highway mpg. But I think the fuel economy would still be quite impressive, especially compared to an equivalent gasoline model. I still stand by my prediction that the 320 CDI will yield highway mpg numbers somewhere in the 30's for most people.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL