I disagree, when looking at a 520d and a 530i tax shouldn't come on to it. On a mega cheap run around the extra £165pa would make a fair amount of difference. £200pa tax could cost more than the depreciation, £35 would not! With my first car by far and away the biggest cost per year was tax
Tax cost you more than insurance and fuel?
Assuming that actually happens that is, for me an old 1.8D (non turbo iirc) Mondeo was a good few hundred more to insure than a Polo 1.4 16v and I know which one I preferred.
I think this idea behind a big car like a Mondeo being cheaper to insure is a bit of a myth. I can understand the logic behind it but i'm yet to find anyone who has actually had cheaper quotes.
No such thing as a non turbo diesel mondeo, regardless of age.
It's not a myth, it's just misunderstood. For a start, most mainstream insurers and comparison sites will return higher prices. It's when you start talking to the specialists that you will see a difference. It also doesn't work for everyone, certainly worked for me - larger, less cool cars were always considerably cheaper to insure.
Finally, even of it's not specifically cheaper, it's about value for money rather than direct cost. If you can insure a mondeo for 1500 and a fiesta for 1200, od have the mondeo every single time.