I've been tempted, or should I say very tempted, by an S4 avant. My only concern is fuel economy (well that and the neighbours will say when they hear it!), my heart says buy it, but my brain says that a 4.2 is going to be thirsty. Would any owners past or present care to share their average real word consumption figures? I mainly do motorway driving with a little bit of around town thrown in. Not a speed freak either, but do enjoy the odd spirited run! Thanks in advance.