C63 Bi Turbo W205

[Krise]

Evening all

Moving out of London soon and kids are a bit older so don’t need as much space so the trusty Volvo barge is going to get moved on.

As a last stop before we move to being an electric car family I want another quick car, I really fancy a C63, 2016/17 ish ideally I would like a convertible or saloon with the sports seats.

I would be buying from a Merc main dealer, I see they all come with a 2 year warranty, aside from tyres and fuel are there any particularly scary running costs ?

What’s the service schedule like, at what mileage or year is the “big” service due ?

Not particularly put of by big running costs, but would like to factor those into purchase decisions.

Also is it likely to see 25mpg on a steady motorway cruise ?

Thanks in advance

Krise