Hi there Will be changing my S3 soon and am seriously considering an S4. I have seen this one locally: http://usedcars.audi.co.uk/carview.aspx?id=501633088 How does the price seem (bearing in mind this is a main dealer?). I would be looking to part-ex the S3 - like to think I would get £10,500 for it. Also, how do the running costs of the S4 compare to the S3? I appreciate I will lose around 10MPG but what about servicing etc? Thanks.