I am thinking of buying a 2003 S4 to replace my S3. Mainly because I've just had a kid and the wife thinks the S3 is too small. I think the S4 is really the only replacement I want. I'm just a bit worried about the running costs. I don't wnat the car if I can't afford to drive it properly. What is a realistic fuel consumption I can expect? Is it practicle enough? 30k is my maximum so I'm obviously limited in choice. I've had a 10min test drive but will I be equally impressed after 6 months?