I'm a recent convert to diesel
I run two cars, a modified 440hp V8 5.5l SLK and a diesel polo bluemotion.
The merc gets 15-18mpg round town and the polo 75mpg + . I've just done London - Norwich - Worcester - London..grand total of 490 miles and its not even used a full tank of 40 litres. What i particularly like is the mid range torque which is way better than the recent small engined petrol cars i've driven