So, im contemplating chopping in my B8.5 saloon for an B8.5 S4 Avant now we have our first born.... Did consider a 3.0 TDi Avant but in my opinion diesel cars in the near future are going to be very hard to re-sell so going petrol seems logical, and buying a slow one well just no. I do alot of mway miles, 18 to 20k a year. My daily commute is a 55 mile round trip of nearly all A road dual carriageway... We all know the book figure mpg's are lies, so realisticly what could i expect from a spirited drive in an S4... I average around 35 mpg in my TDi Quattro the way i drive it. Regularly 40+ mpg on long 300 mile mway drives up north to inlaws. As for servicing i dont bother with main dealer on 4+ year old cars so its always specialist indy garages.