Newbie needing advice on A6 purchase

[Candleman]

Hi,i am new to this forum and am currently driving an E class estate.

I am looking for advice on changing to an A6 3.0TDI Quattro estate (New).

Although not as roomy an estate as an E class ,it seems better equipped with standard items.

What are the servicing costs like?

Tyres -what sort of life does a Quattro give?

Any problemsyou get with this car?

MPG -what should be a realistic expectation-driving 23K P.A on all sorts of roads?

Any other advice would be helpful

Thanks