S3 Superb 4x4 270 petrol vs 190 tdi..... Thoughts?

Hi all, long time, no post..... 

I find myself being booted out of my work company car scheme and I need a new vehicle (2nd hand) in November. I'm coming out of a Volvo S90 2.0tdi auto with Polestar tuning (slight increase in bhp and torque and gearbox flexibility).

I've had a Mk1 and Mk2 Superb and find myself drawn back to the model when it's my own money being spent. The crux of my question is, should I go for the petrol or diesel 4x4? I'll be paying for my own fuel so I'm kind of drawn to the TDI SCR engine, however, there are occasions that the petrol can offer decent fuel economy (I've read with interest the post regarding ownership of a 272 in the Superb pages). If it were your money, would you go petrol or diesel? I'm going to be doing around 18k miles a year. Currently my big Swedish Barge returns 39.9mpg - I like that figure.... Any advice welcomed :-)

Cheers

Stunts